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The act of two lesbians forcefully, but lovingly, inserting the knuckles and or fist in to any orifice of choosing.
Debra whispered softly to Jessica, "Wanna 'Thunder Knuckle'?" as she pumped her fist into the sky.
Sweaty, stank crotch meat. Gender neutral.
Yeah she was fine, but there won't no play. Girl had some serious Hot Knuckle!!!
To punch someone in the mouth to shut them up.
Tom: you're just jelous of me cuz I slept with your girl and you didn't. And y'know what? she liked it so much that I...
Edd: IF YOU DON'T SHUT UP, I'LL GIVE YOU A KNUCKLE SANDWICH
1. When the penis is folded over in your pants and protrudes through revealing a short nub to be seen by all, giving you that uncomfortable feeling that you cannot fix when you are in public.
2. A lazy person who is dumb founded to everything around him/her.
After the awkward silence, he said, "Why you gotta be a penis knuckle?"
You're a penis knuckle!
To prepare to kick another's ass, getting prepared to engage in fisticuffs
If you get up in my grille, you best knuckle up, motherfucker
1) the result of wankin' it in the shower; the jizz runs down your hand, and gets stuck to your knuckles
2) a very unintelligent individual, or someone who happens to have said something stupid in the recent past
1) Goddammit! I hate when I come to class and still have cum knuckles... should've cleaned those bitches after jackin' it this morning
2) "I thought baseball was only seven innings." "Shut up, cum knuckles."
A. When you stick your hand up a person's ass and lick your hand afterwords.
B. A dumb, ignorant, piece of crap, that jerks it to videos of bunnies and rainbows.
C. Bert
Why whould you do that? You're such a "Fag Knuckle."
Bert is a fag knuckle.