The condition of having an asshole itch so intense and deep that it feels like the only way you can properly scratch it is to stick your finger up your ass all the way up to the knuckle, and scratch your asshole from the inside.

A case of knuckle ass might be the result of poor hygiene (see hanus anus) or could just be an unlucky ass itch that anyone can get from time to time.

"I took a shit this morning and I guess I didn't wipe well enough. Now I've got major knuckle-Ass"

Knuckle-Ass by smrtpntz November 12, 2011

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knuckle dusters

knuckle dusters are another term for the illegal, easily concealable weapon, brass knuckles.
To dust ones knuckles is to put on Brass Knuckles.

A: Oh shit son! Check out them knuckle dusters! that guys gonna fuck somebody up!
B: That guy just got a knuckle dusted fist to the chin.
C: I'm gonna have my knuckles dusted tonite.

knuckle dusters by essextwo January 27, 2006

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Knuckle Slipping

To have your nipples sucked while hanging from the monkeybars.

After class one night two frisky law students walked to the park and he started knuckle slipping her.

Knuckle Slipping by CrackerJax78 April 1, 2010

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