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Someone who is a complete and utter idiot.
1. Don't be such a fuck knuckle.
2. That fuck knuckle crossed the highway without looking.
3. If you're going to be a fuck knuckle, you can piss off.
Look up Donald Trump on Google if you are unfamiliar. (Absolute retarded fuckwit cockhead).
It is when you clock a muther fucker in the face while you have your middle finger extended.
Dude this chauch was talking serious trash at the club last night, so I straight up Knuckle Fucked his ass.
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
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.
Dude, that guy hit the pro jump line and knuckle fucked the last jump.