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]