by #CoronaTime_420_69_51 March 25, 2020
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
to go knuckle deep into the anal regions of the other gender while your other knuckle is 5 inches deep in their other genital region.
you have just been fuck knuckled by him
by Gizard XD March 1, 2017
When hitting a large jump (booter) mainly on skis there is a roller or knuckle that the jump sits on. If you hit that jump and land a little short that is called a case. But if you case the jump so hard that you are ejected from your skis and you thrust your body so hard against the landing that is called a Knuckle Fuck because you are fucking the knuckle.
by AbsorbedSpoon3 July 6, 2019