The skin or fold that the butt creates when standing up, and dissappers when bending over. Its the space between the upper thigh and the bottom of the booty. Common is girls with large behinds.
DAYUM! that girls ass is so damn big that you could hide a hamster in that booty knuckle!
by Brooke Is a SKANK August 19, 2009
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An extremely aroused, engorged clitoris.
With the aid of a few fellow Chaturbaters, She diddled her velvet knuckle till she squirted for her horny followers.
by Eaton Holgoode March 02, 2017
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To finger a girl, especially in a public setting like a movie.

The male equivalent of giving a handjob.
I've only been out with this chick twice, and she already let me sink a knuckle!
by ImTheMayor June 24, 2010
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In the literal sense, something utterly uncomfortable and unnatural--an aberration. In addition, a complete asshole; someone whose presence makes you wish time travel existed so you might jump back to their conception and prevent it. A total cunt.
"You're such a fucking twat knuckle."

"My twat knuckle is really achy today!"
by Narwhal Rider March 02, 2009
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1, n. Slang term for the head, specifically the top of the head when used in a headbutt. Obviously, it refers to the idea that if you punch with your knuckles, a headbutt uses one big knuckle.
2, v. To headbutt someone, aka "give 'em the big knuckle."
Did you see that? Zinedine Zidane just gave that dude the big knuckle!

Ooh, right to the face with the big knuckle! Looks like his skull knocked out a few of his opponent's teeth!

Good answer--that's using the big knuckle.
by Talmanes December 20, 2006
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A member of a militia who must protect his queen at all costs.
Yo have you seen those little red dudes in VR-Chat?

Yeah, they are called Ugandan Knuckles, and they are relentless in protecting their Queen and spreading their ways!
by ChefDeen January 13, 2018
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A weapon consisting of heavy brass (the cheap plastic ebay ones dont count) that have holes for you to put your fingers through, in order to get a grip and form a fist. Once this is done, you can use the weight and hardness of the brass to injure soft flesh. Pretty effective at ruining people's day, but if you dont know how to fight you may get it taken off your own hands and then used against you. Imagine that.
You try to get slick, you bust a little chuckle, you're gonna get smacked with my gold finger kuckles.
by Leandro October 30, 2004
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