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A child. Usually someone elses child, although it can also be used as a future child you don't want to ever have.
"im going to shove that happy meal down your little crotch monster's throat if he throws another mcnugget at me!!!"

"nah homey, shes on the pill. don't need a little crotch monster anytime soon.
by gravityXaddict July 17, 2008
3 4
A hungry midget that lives in your buttcrack. He eats your pants, which causes murphs and wedgies.
Ivan, the crotch monster's eating your shorts.
by wysiwyg May 15, 2004
9 18