knuckle sack
A tight sack with defined hemispheres male camel toe.
Roger came out of Bellagio's pool sporting a small Knuckle Sack
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.