Feces that contains a large amount of corn lodged inside of it. Usually in the shape of a brown log "corn crap" contains yellow nibblets that protrude like branches on a tree.
"I had so much corn tonight im gonna have a huge corn crap."
The short bursts of painone experiences when they need to take a dump or 'crap'. Similar in length and style to contraptions that a women will experience during labour before birth.
Wife: 'Arghh these contraptions are killing me'
Husband: 'I had Indian food yesterday and the toilet's blocked. My concraptions are way worse'