knucklehead 

a person who doesn't listen, and stays in trouble

Dat boy a knucklehead he stay in trouble.

knucklehead by J-Wilk May 21, 2007

knuckleduster 

A british term for brass knuckles.

I hit him in the side of the face with my knuckleduster.

knuckleduster by Combat 84 June 28, 2004

Uncle Knuckles 

For a female, Uncle Knuckles is the act of allowing an older male, preferably 10-20 years older than herself, to finger bang her pussy.

Hey Donna. What's the matter? You seem like you are day dreaming. Oh I am. I went to a bar last night and had me an Uncle Knuckles. How was it? He said it was finger licking good.

Uncle Knuckles by Eaton Holgoode June 24, 2009

Knucklebob 

Fingering your bootyhole or the bootyhole of another with your middle finger up to the third knuckle.

Beth was squirming last night when I did a little knucklebob.

I can’t shit today. I knucklebobbed myself last night.

Knucklebob by Eaton Holgoode October 6, 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.

Jack Knuckles by Eaton Holgoode December 8, 2017

cum knuckles

when you beat your cock so fucking hard your knuckles are slathered in cum

OMG I had the biggest case of cum knuckles when looking at a picture of ur mom.

cum knuckles by ryangb871 January 20, 2022

Tommy Tuff Knuckles 

Tommy is a bissness man out of NYC. Getting his start by manufacturing 6.5" chains and cables for construction sights. He's a know friend and colleague of Balboni

You guys work with Tommy Tuff Knuckles out of New York City, don't ya?

Tommy Tuff Knuckles by Tommy Tuff Knuckles August 29, 2023