sack-skinning

This is simply when you expose the hairy flesh that covers your testicles. Usually used to scare or freak out you friends. Oftenly get called a faggot for it.
Jim: Dont go over there Dan is sack-skinning everyone again.
Joe: Oh wow he's such a faggot.

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dwedgie

This is a dick wedgie. It is when ur underwear rides up the middle of your sack.

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Hairtopping

This is when someone discreetly rips out on of the hairs on their nutsack or head and puts it on an item of food.
Jon: Aw shit, Dan just hairtopped me again.
Dan: Haha you dumb motherfucker!

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