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Sack Knuckle 

When a man is wearing tight pants and the crotch seperates his testicles showing a bulge on each side of the seam.
Look at that guy, his pants are so tight I can see his sack Knuckle.
Sack Knuckle by Otis The Duke January 26, 2009

Knuckle Sacker

Someone who will have sex with anyone.
Damn, look at that girl he's with... He's a total Knuckle Sacker!!! She's hideous!
Knuckle Sacker by boinkacceptor September 26, 2010