knuckle sandwich

to administer a mouthful of fist; to punch someone in the face

you want a knuckle sandwich?

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knuckle shuffle

To masturbate quickly.

Johnny did a knuckle shuffle on his piss pump.

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Poop Knuckle

The result of an improper angle of approach when wiping your ass from a particularly messy poop-session. Poop gets on your knuckle. Usually occurs when you lift a cheek to the side and attempt a wipe.

Steve liked to lean to the left when he wiped his ass. This often resulted in a nasty case of poop knuckle.

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bare-knuckle

Street Fighting, Underground fighting. A type of fighting with no gloves or anything covering your fists.

Bare-Knuckle fighting is a real mans sport

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Swamp Knuckle

A hybrid of moose knuckle and swamp crotch that can only be created in the moistet of environments.

When a woman who is sporting a predominant moose knuckle, is sitting and marinating in a humid environment or pours water on herself to cool off, creates a swamp like environment in her nether regions leading to what can only be described as swamp knuckle

knuckle sack

A tight sack with defined hemispheres male camel toe.

Roger came out of Bellagio's pool sporting a small Knuckle Sack

Hot Knuckle

Sweaty, stank crotch meat. Gender neutral.

Yeah she was fine, but there won't no play. Girl had some serious Hot Knuckle!!!