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1.
The hard roundish mass contained in a male mamal's scrotum. Generally found 2 to a sack. Testicles.
I noticed the lump after she cracked my Crotch Knuckles
by Oh Shit February 08, 2008
 
2.
A term for a woman's clitoris. Because of its location in between the legs, it almost resembles a knuckle on a hand in between two fingers.
I got her off by rubbing her crotch knuckle.
by The Massiah December 05, 2010