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slack knuckle

A male version of the infamous camel toe, esp. when flaccid.
"Holy cow! That is the biggest slack knuckle I've ever seen!"

"That guys pants are so tight his slack knuckle is poking out like crazy."
by Jadder Obbins July 7, 2008
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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.
by Otis The Duke January 26, 2009
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knuckle sack

A tight sack with defined hemispheres male camel toe.
Roger came out of Bellagio's pool sporting a small Knuckle Sack
by Ms. Vegas May 26, 2016
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