1. a very large penis.
2. the owner of a very large penis.
dude, my cock is an asscruncher!
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Almost a synonym for megadingus, or asshead. Usually defines a person or entity that is stubborn, being an asshole, or plain retarded.
Person 1: Dude you are such an asscrunch!
Person 2: SHUT THE FUCK UP MOTHERFUCKER!