Fuck Knuckle

A man with such a small dick that all it feels like when he fucks a woman is him fucking her with the knuckle on his fist.

HER: Enough playing around stick it in already
HIM: What you talking about Willis? It is in!
HER: I should have known you'd be a fuck knuckle.

by Cereal Killer Bitch March 20, 2017

fuck knuckle

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”.

by Wayne Schlinger & Kevski September 23, 2021

Fuck Knuckle

The second knuckle of any digit when inserted into an orifice in a sexual manner.

I was fingdipin' this girl to the fuck knuckle after the baseball game the other day.

by elcapitandeganja October 18, 2013

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

by Marty's ass September 25, 2020

fuck knuckle

A person so dumb they can't tell the diffrence of a penis or finger and think the knuckle on a finger is the end of the dick head.

That bitch was so gross I couldn't get hard. So I fucked her with my finger and told her I have a small dick. She said the end of my head was big she is so dumb what a fuck knuckle

by Rawdog75 January 13, 2025

fuck knuckle

Someone who is beating off, fucking their own hand fuck knuckle

Hey fuck knuckle stop beating off

by Invented that word December 10, 2024

fuck knuckle

When said person is being annoying or is being a headass

Person 1: “God, Michael is being such a fuck knuckle”
Person 2: “You can say that again”

by CurseWordGenerator2000 January 28, 2019