The Collaborative International Dictionary of English v.0.48:

Crap \Crap\ (kr[a^]p), v.
   1. to defecate. Same as take a crap. [vulgar]
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Crap \Crap\ (kr[a^]p), n.
   1. In the game of craps, a first throw of the dice in which
      the total is two, three, or twelve, in which case the
      caster loses. Also called craps.
      [Webster 1913 Suppl. +PJC]

   2. same as excrement and feces. [vulgar]

   Syn: shit. [PJC]

   3. nonsense; balderdash; bullshit; -- also used as an
      expletive. [vulgar]

   Syn: bullshit. [PJC]

WordNet (r) 3.0 (2006):

crap
    n 1: obscene terms for feces [syn: crap, dirt, shit,
         shite, poop, turd]
    2: obscene words for unacceptable behavior; "I put up with a lot
       of bullshit from that jerk"; "what he said was mostly bull"
       [syn: bullshit, bull, Irish bull, horseshit, shit,
       crap, dogshit]
    v 1: have a bowel movement; "The dog had made in the flower
         beds" [syn: stool, defecate, shit, take a shit,
         take a crap, ca-ca, crap, make]

Moby Thesaurus II by Grady Ward, 1.0:

94 Moby Thesaurus words for "crap":
   BM, balls, baloney, bilge, blague, blah, blah-blah, bloody flux,
   bop, bosh, bowel movement, buffalo chips, bull, bullshit, bunk,
   bunkum, ca-ca, cast, catharsis, claptrap, coprolite, coprolith,
   cow chips, cow flops, cow pats, craps, defecate, defecation,
   dejection, diarrhea, dingleberry, drivel, droppings, dung,
   dysentery, evacuate, evacuation, eyewash, feces, feculence, flam,
   flapdoodle, flimflam, flux, gammon, gas, guano, guff, gup, hogwash,
   hoke, hokum, hooey, hot air, humbug, humbuggery, jakes,
   jiggery-pokery, lientery, loose bowels, malarkey, manure,
   moonshine, movement, natural, nick, night soil, number two, ordure,
   piffle, poppycock, purgation, purge, roll, rot, runs, scat, sewage,
   sewerage, shit, shits, shot, stool, take a shit, throw, tommyrot,
   tripe, trots, turd, turistas, twaddle, void, voidance, wind