Knuckle dunking 

Inserting your fingers into a woman’s vagina up to your knuckles.

The wet spot on the bed was enormous after Britney received her first knuckle dunking.

Knuckle dunking by WordMagic May 30, 2018

knuckle airlines 

Telling someone there about to get punched -

"Your about to take a flight on Knuckle Airlines, and you've been upgraded to Fists Class"

knuckle airlines by Chris Mags November 14, 2006

knuckle hailstorm 

A barrage of knuckle punches on a individual during a first class ass whooping.

John Doe: I'm sorry, what did you say?

Crazy Mick (foreigner): I said f*@k your mom and the USA!

This insult is quickly followed with an immediate reign of knuckle hailstorm to the poor fellow.

knuckle hailstorm by CptAmerica April 18, 2011

Knuckle Children 

Ejaculation from the act of masturbating.

What kind of country is this where a decent man can't go into the privacy of his neighbors house and fire off a couple of knuckle children because he doesn't own a dvd player?

Knuckle Children by Sgt. Scrotes September 25, 2005

knuckle dragger 

Reminiscent of the hunched over cave man, with his arms to the ground. An insult used against those of extremely low intelligence, or general stupidity.

Also see low brow

Bubba is such a knuckle dragger.

knuckle dragger by Matt September 29, 2004

Knuckle Fishing 

The seductive art of fingering one's vagina

Mary & I were fooling around at her house last night & even though she wouldn't let me go all the way she did let me go knuckle fishing while her parents were upstairs watching Glee.

Knuckle Fishing by Jahangaleez September 30, 2010

Knuckle Cheese Knockout 

When a man cums on his fist, and punches his sexual partner in the face.

Dude, Jen told me she cheated on me, so during our break up sex, I gave her a knuckle cheese knockout and stole her purse.

Knuckle Cheese Knockout by Jizzsaw April 1, 2009