Another term for a lesbian. To get a visual example, bend both the index and middle finger of each hand and bump the mid knuckles together thus simulating two vaginas bumping each other as lesbians do to get sexual pleasure, such as the extremely hot act of tribbing.
Guy 1: "Hey dude, have you met the new girl? She's hot!"
Guy 2: "Yeah, but dude she's a knuckle bumper. There's rainbows and shit all over her social network profile."
Have you ever heard of a blue knuckle? Check out McCain’s finger.
A condition often aquired at the end of the NCAA Basketball season during Conference Championship Week and the first few rounds of the NCAA Basketball Championship--affectionally known as March Madness. It results from changing the channel every few seconds trying desperately to catch every second of every game, but in the end never fully achieving the satisfaction and release from the closure of seeing every play of every game.
Caller: "Dude, have you been watching March Madness hoops?"
Friend: "Hell yes! The only thing is, I've got to put a bag of frozen peas on my knuckles in between games. Having four games on at once is killing me, I've got a serious case of Blue Knuckle...it's a damn good thing I've got two hands!!!
single male that constantly searches for female companion to lay
"That boy ain't no gentleman, he's a knuckle hunter!"
A slang term for a dumb mother fucker who really does not understand they are a dumb mother fucker.
After a lame conversation I had to say, “He is such a fuck knuckle”.
A more poignant or harsher word for the abusing the common wanker/tryhard/yuppie douche-canoe
You're porno movies are on the shelf next to that fuck-knuckle with his shirty goatee in the corner