Dude this chauch was talking serious trash at the club last night, so I straight up Knuckle Fucked his ass.
by Freak Sho September 26, 2010
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Get the knuckles christmas mug.A crusty knuckle is when you have your girl stimulate your prostate by shoving her middle finger up your anus. Look at her knuckle once she is done.
by John Chapman June 1, 2007
Get the crusty knuckle mug.to engage in a fist fight
by easyrider September 16, 2007
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