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]

The Collaborative International Dictionary of English v.0.48:

Craps \Craps\ (kr[a^]ps), n.
   A gambling game with dice. It is one of the more popular
   games in casinos. [Local, U.S.]
   [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

craps
    n 1: expressions used when when two dice are thrown and both
         come up showing one spot [syn: craps, snake eyes]
    2: a gambling game played with two dice; a first throw of 7 or
       11 wins and a first throw of 2, 3, or 12 loses and a first
       throw of any other number must be repeated to win before a 7
       is thrown, which loses the bet and the dice