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1.
A disturbing hump that appears on fat old ladies crotches, looks like a second ass.
MEYER HAS THE BIGGEST Ass-Crotch EVER!!!!
by SMURF_THAT_HATES_MEYER July 09, 2004
 
2.
The area just above your asscheeks. Also considered plumber's crack and where girl's thongs are exposed (whaletail).
"I ran so much that my asscrotch was wet with sweat"
by ray hidalgo February 01, 2006