n, a noun to describe the type of person who upon seeing you immediately want to fuck right in the face with your knuckle,

v, a Fuck Knuckle is a person who would benefit from having their face rearranged on a permanent basis using only a fist
Sean: "Jo do you see that Fuck Knuckle across the street?"

Jo: "Yeah go put his face in a new shape, He's a Fuck Knuckle!"
by The Fairy Sesh Mother November 27, 2019
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General dickhead. See also Fucker, Asshole, Cunt et al.
That's not my wife you stoopid fuck knucle!
by Izzy Stewart April 8, 2003
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Can be used to describe a person who is generally a dickhead, or used when something goes wrong.
by ~primakat~ August 5, 2005
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Someone who is intensely stupid, useless, or just plain ignorant.
"You can't clean a toilet with a rake, you stupid fuck knuckle"
by MichaelMayfall December 30, 2015
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General term for somebody who is an useless idiot, ignorant, highly unpopular, or hated.

Commonly used by Australians to describe people in positions of responsibility who are incompetent.
Worker #1 - The boss says we have to make 34 more panels but we've only got two hours till knock off time ...

Worker #2 - Yeah right, what a fuck knuckle!
by Notorious S.T.I.F.F June 29, 2011
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Similar to definition 1 for Fuck Nuts
Specifically a name for somebody you know and despise in one way or another.
"Have you met Wendy's new boyfriend Eric? Man, what a fuck knuckle that guy is!"
by Simonator May 4, 2006
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A person who is equally a fuck head and who you want to plant your nuckel in.
Friend: Who's he
Me: Oh he's just some fuck knuckle
Friend: Wow what an idiot
by ThiccyBoii March 20, 2017
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