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1.
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 Jaders July 07, 2008
0 3

Words related to slack knuckle:

camel toe mantoe moose knuckle ninja jacket pants penis