crap 2 
(krăp)
(krăp)n.
1. See craps.
2. A losing first throw in the game of craps.
v. crapped, crap·ping, craps
Phrasal Verb: To make a losing throw in the game of craps. Usually used with out.
crap out Slang
1. To fail to keep a commitment or promise: crapped out on me when I needed him.
2. To fail to function properly: The old TV crapped out again.
3. To leave: crapped out of the meeting early.
[Back-formation from CRAPS.]