From The Collaborative International Dictionary of English v.0.48:

Bang \Bang\, v. t.
   To cut squarely across, as the tail of a horse, or the
   forelock of human beings; to cut (the hair).
   [1913 Webster]

         His hair banged even with his eyebrows.  --The Century
                                                  Mag.
   [1913 Webster]

From The Collaborative International Dictionary of English v.0.48:

Bang \Bang\, n.
   The short, front hair combed down over the forehead, esp.
   when cut squarely across; a false front of hair similarly
   worn; -- usually used in the plural; as, her bangs came down
   almost to her eyes.
   [1913 Webster]

         His hair cut in front like a young lady's bang. --W. D.
                                                  Howells.
   [1913 Webster] Bang

From The Collaborative International Dictionary of English v.0.48:

Bang \Bang\, v. i.
   1. To make a loud noise, as if with a blow or succession of
      blows; as, the window blind banged and waked me; he was
      banging on the piano.
      [1913 Webster]

   2. To have sexual intercourse; to fuck. Considered vulgar and
      obscene. [vulgar slang]
      [PJC]

From The Collaborative International Dictionary of English v.0.48:

Bang \Bang\, n.
   1. A blow as with a club; a heavy blow.
      [1913 Webster]

            Many a stiff thwack, many a bang.     --Hudibras.
      [1913 Webster]

   2. The loud sound produced by a sudden concussion or
      explosion.
      [1913 Webster]

   3. A surge of pleasure; a thrill; -- usually used in the
      phrase get a bang out of; as, I always get a bang out of
      watching an ice skater do a quadruple jump. [informal]

   Syn: kick[5].
        [PJC]

   4. (Printing & Computers) An exclamation point; -- used in
      verbal descriptions of text, in printing and in computer
      technology; as, his email address is tom bang stanford dot
      edu (i.e. tom!stanford.edu). [slang]
      [PJC]

   5. An instance of sexual intercourse; a fuck. Considered
      vulgar and obscene. [vulgar slang]
      [PJC]

From The Collaborative International Dictionary of English v.0.48:

Bang \Bang\ (b[a^]ng), v. t. [imp. & p. p. Banged; p. pr. &
   vb. n. Banging.] [Icel. banga to hammer; akin to Dan. banke
   to beat, Sw. b[*a]ngas to be impetuous, G. bengel club,
   clapper of a bell.]
   1. To beat, as with a club or cudgel; to treat with violence;
      to handle roughly.
      [1913 Webster]

            The desperate tempest hath so banged the Turks.
                                                  --Shak.
      [1913 Webster]

   2. To beat or thump, or to cause (something) to hit or strike
      against another object, in such a way as to make a loud
      noise; as, to bang a drum or a piano; to bang a door
      (against the doorpost or casing) in shutting it.
      [1913 Webster]

   3. To have sexual intercourse with; to fuck; -- usually used
      with the male as a subject. Considered vulgar or obscene.
      [vulgar slang]
      [PJC]

From The Collaborative International Dictionary of English v.0.48:

Bang \Bang\, Bangue \Bangue\, n.
   See Bhang.
   [1913 Webster]

From WordNet (r) 2.0:

bang
     n 1: a vigorous blow; "the sudden knock floored him"; "he took a
          bash right in his face"; "he got a bang on the head"
          [syn: knock, bash, smash, belt]
     2: a sudden very loud noise [syn: clap, eruption, blast,
        loud noise]
     3: a fringe of banged hair (cut short squarely across the
        forehead)
     4: the swift release of a store of affective force; "they got a
        great bang out of it"; "what a boot!"; "he got a quick
        rush from injecting heroin"; "he does it for kicks" [syn:
        boot, charge, rush, flush, thrill, kick]
     5: a conspicuous success; "that song was his first hit and
        marked the beginning of his career"; "that new Broadway
        show is a real smasher"; "the party went with a bang"
        [syn: hit, smash, smasher, strike]
     adv : directly; "he ran bang into the pole"; "ran slap into her"
           [syn: slap, slapdash, smack, bolt]
     v 1: strike violently; "slam the ball" [syn: slam]
     2: to produce a sharp often metallic explosive or percussive
        sound; "One of them banged the sash of the window nearest
        my bed"
     3: close violently; "He slammed the door shut" [syn: slam]
     4: move noisily; "The window banged shut"; "The old man banged
        around the house"
     5: have sexual intercourse with; "This student sleeps with
        everyone in her dorm"; "Adam knew Eve"; "Were you ever
        intimate with this man?" [syn: roll in the hay, love,
        make out, make love, sleep with, get laid, have
        sex, know, do it, be intimate, have intercourse,
        have it away, have it off, screw, fuck, jazz, eff,
         hump, lie with, bed, have a go at it, get it on,
         bonk]
     6: leap, jerk, bang; "Bullets spanged into the trees" [syn: spang]

From Moby Thesaurus II by Grady Ward, 1.0:

313 Moby Thesaurus words for "bang":
   abruptly, accurately, aggressiveness, antitoxin, backfire, bag,
   bang into, bangs, bar, bark, barricade, bash, baste, bat, batten,
   batten down, batter, beat, beating, belt, best, better, biff,
   blast, blow, blowout, blowup, bolt, bonk, boom, booster,
   booster dose, booster shot, boot, buffet, bump, bump into, burst,
   bust, button, button up, cannon, carom, carom into, charge, choke,
   choke off, chop, clap, clash, clip, clobber, close, close up,
   clout, clump, coldcock, collide, come into collision, concuss,
   confront each other, constrict, contain, contract, cover, crack,
   crack up, crash, crash into, crump, crunch, cut, dash, dash into,
   deal, deal a blow, deck, detonate, detonation, dig, ding, dint,
   discharge, dose, draft, drive, dropping, drub, drubbing,
   drug packet, drumming, encounter, enterprise, exactly, exceed,
   explode, explosion, fall foul of, fasten, fetch, fetch a blow,
   fetlock, fire, fix, flail, flap, flare, flash, fleck, flock, flop,
   flush, fold, fold up, forelock, foul, fringe, fulguration,
   fulminate, fulmination, fusillade, get-up-and-go, getup, ginger,
   go, go off, gunshot, hammer, hastily, hit, hit a clip, hit against,
   howl, hurt, hurtle, hypodermic, hypodermic injection, impetuously,
   impinge, impulsively, initiative, injection, inoculation, jab,
   jet injection, jollies, key, kick, knock, knock against,
   knock cold, knock down, knock out, lambaste, larrup, latch,
   let have it, lick, lift, like a flash, like a thunderbolt, lock,
   lock out, lock up, mainlining, maul, meet, narcotic injection,
   narcotic shot, noise, occlude, of a sudden, on short notice, outdo,
   outgo, outshine, outstrip, overdose, padlock, paste, patter, pelt,
   pep, pepper, percuss, piss and vinegar, pizzazz, plop, plumb,
   plump, plunk, poke, pommel, poop, pop, popping, portion, potion,
   pound, precipitantly, precipitately, precipitously, precisely,
   pulverize, pummel, punch, push, quiff, quiver, rap, report, right,
   roar, roll, rumble, run into, rush, rush of emotion, salvo, seal,
   seal off, seal up, secure, sensation, sharp, shiver, shooting up,
   shot, shudder, shut, shut the door, shut up, sideswipe,
   skin-popping, slam, slam into, slap, slat, sledgehammer, slog,
   slug, smack, smack into, smack-dab, smash, smash into, smash up,
   smite, snap, soak, sock, sound, spang, spank, splat, spunk, square,
   squarely, squeeze shut, starch, startlingly, strangle, strike,
   strike against, strike at, stroke, successful, sudden, suddenly,
   surge of emotion, surprisingly, swap, swat, swing, swipe, tap,
   tattoo, thrash, thresh, thrill, thrust, thump, thunder, thwack,
   tingle, tingling, titillation, tremor, tremor of excitement, tuft,
   unawares, unexpectedly, vaccination, vaccine, verve, vim, vitality,
   volley, wallop, whack, wham, whap, whip, whomp, whop,
   without notice, without warning, wow, yerk, zing, zip, zip up,
   zipper

From Jargon File (4.3.1, 29 Jun 2001):

bang 1. n. Common spoken name for `!' (ASCII 0100001), especially when
   used in pronouncing a bang path in spoken hackish. In elder days
   this was considered a CMUish usage, with MIT and Stanford hackers
   preferring excl or shriek; but the spread of Unix has carried `bang'
   with it (esp. via the term bang path) and it is now certainly the most
   common spoken name for `!'. Note that it is used exclusively for
   non-emphatic written `!'; one would not say "Congratulations bang"
   (except possibly for humorous purposes), but if one wanted to specify
   the exact characters `foo!' one would speak "Eff oh oh bang". See
   shriek, {ASCII}. 2. interj. An exclamation signifying roughly "I
   have achieved enlightenment!", or "The dynamite has cleared out my
   brain!" Often used to acknowledge that one has perpetrated a thinko
   immediately after one has been called on it.

From The Free On-line Dictionary of Computing (27 SEP 03):

bang
     
        1. A common spoken name for "!" (ASCII 33), especially when
        used in pronouncing a bang path in spoken hackish.  In
        elder days this was considered a CMUish usage, with MIT
        and Stanford hackers preferring excl or shriek; but the
        spread of Unix has carried "bang" with it (especially via
        the term bang path) and it is now certainly the most common
        spoken name for "!".  Note that it is used exclusively for
        non-emphatic written "!"; one would not say "Congratulations
        bang" (except possibly for humorous purposes), but if one
        wanted to specify the exact characters "foo!" one would speak
        "Eff oh oh bang".
     
        See pling, shriek, ASCII.
     
        2. An exclamation signifying roughly "I have achieved
        enlightenment!", or "The dynamite has cleared out my brain!"
        Often used to acknowledge that one has perpetrated a thinko
        immediately after one has been called on it.
     
        [Jargon File]
     
        (1995-01-31)