bum knuckle 

The lower part of the spine, the coccyx.

I slipped on the ice and landed on my bum knuckle.

bum knuckle by farther jack June 14, 2010

Douche Knuckle 

A cross between a complete douche and somebody stupid, proven more effect at winning an argument than two camels in a tiny car.

SHUT UP DOUCHE KNUCKLE

Douche Knuckle by paigiesaurpandemic September 10, 2010

The Fuckle Knuckle 

The act of penetrating both a woman’s anus and vagina with two fingers each, on the same hand. The hand should be held stiff and look like a curved “live long and prosper” hand sign.

“Yo I did the fuckle knuckle on suzy last night”
“Doesn’t your hand hurt bro???”
“Yeah but the carpal tunnel is worth it”

The Fuckle Knuckle by DecafCyanide December 6, 2017

moose knuckle 

The male equivalent of a camel toe.

I was at the gym, and this guy came in wearing spandex. Fuckin' moose knuckle up the wazz.

moose knuckle by Bill Diesel April 5, 2005

Knuckle fuck 

When a guy's dick is soft so he squeezes the base and tries to fuck till its hard. While holding the base he hit's the other person repeatedly with his knuckles.

Well if it goes soft we have to take a break. I hate when a guy tries to knuckle fuck me. I end up with bruses.

Knuckle fuck by Wonder77 December 25, 2016

knuckle biter 

So hot you need to bite your knuckle to control yourself

Wow check her out, what a knuckle biter

knuckle biter by Jbw March 6, 2018

White knuckle shuffle 

A fast & furious wank,usually when time is short & the need is great.

She was due home any minute,just enough time for a white knuckle shuffle

White knuckle shuffle by Francis B November 20, 2007