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Knuckle Crust 

Dried semen. When remnant semen dries on the fingers after fapping and busting a thick nut all over the hand.
Is that dried skin on your fingers?

Naaahh. I just didn't wipe my fingers to good after fapping this morning. It's knuckle crust.

That's fuckin nasty braaaahhhhh

Knuckle to ass 

When you make a fist with your hand and u rub the knuckles on the frame of an asswhole or in the ass.
Yo that guy be doing "knuckle to ass"

knuckle-duster 

The less-ghetto name for brass knuckles.
Taking a hit with a knuckle-duster in the face will not be very fun.
knuckle-duster by Taikamiya June 9, 2005

knuckle kids 

The act of male masturbation using the five digits of his hand. See tissue baby.
my girlfriend's Aunt Flo is visiting so I spend my lunch break giving birth to knuckle kids.
knuckle kids by canada blows October 9, 2005

knuckle peach

a colorful word for lady parts.

imagine eating a peach, but you can only hold it with your knuckles. the result is messy, and juicy, all over your face, right? well... knuckle peach.
Betty had the sweetest knuckle peach I've ever tasted.
knuckle peach by e-card January 27, 2009

knuckle fuck 

to put it simply, fisting.
i knuckle fucked three chicks and a dude last night.
knuckle fuck by holla at yall July 27, 2009