Knuckle One

To masturbate. Jack off. Rub one out.

Roger was late to class because he stopped at the bathroom to knuckle one.

I had to knuckle one to your mom last night.

by Eaton Holgoode November 13, 2017

Jack Knuckles

A chronic, habitual masturbator. Someone who is always giving himself a tug. Typically addicted to porn, stalks Facebook, Insta and other media for pics to fap off to.

May also be used as a derogatory term for somone who’s a POS.

My neighbor is a real jack knuckles. He’s always giving himself a wank online.

My uncle is a jack knuckles. I catch him tossing off every time I walk past the den.

Fuck that guy. He’s a jack knuckles.

by Eaton Holgoode December 8, 2017

mewtons knuckle

When you're wearing a thong, and your balls are so saggy that each ball falls onto both sides of the thong creating newton ball like balls, and you have someone put their tongue in between both balls, and swing the balls together like newton balls. :)

i'm going to Mewtons Knuckle you so hard your taste buds will never work the same.

by Throbin Hood June 13, 2016

Knuckle Dip

An accidental action that occurs when butt wiping. Usually occurs when one unknowingly has clogged the toilet, wipes his arse, and accidentally touches the water with one's knuckles.

I didn't know the toilet got clogged after my courtesy flush, so when I wiped my ass, I did a knuckle dip.

by Paulkout December 7, 2020

Monkey Knuckle

When fisting someone's anus, and you pull your fist out covered in poop.

I can't believe they didn't clean themselves enough to prevent me from getting monkey knuckles.

by unrealism September 5, 2021

Trunk Knuckle

Sticking a finger in someone's ass at least to the second knuckle of your finger of first knuckle of your thumb.

Hey, that dude really likes when his girl gives him a trunk knuckle around back while getting a blowie.

by Sarcastication January 25, 2013

Knuckle Bunnies

A combination if a knuckle head and dumb bunny.

"The only people who would buy your cockamamie plan is a bunch "knuckle bunnies" on vacation in a volcano."

by Porticia September 4, 2013