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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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 29, 2014
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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 19, 2017
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The painful bend in hard dick caused by pulling out too far and slamming your cock into the taint.
I was railing that bitch so hard I gave myself a fuck knuckle.
by XxxKevinxxX August 15, 2007
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Idiot, tool, moron, fool, useless bastard, politician
stop telling me what to do and sort the country out you fuck knuckle!
by Englishdude January 29, 2010
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A male virgin doomed to a lonely life of masturbating.
Bob, stop jacking off and get out of the shower!... Let him finish, he's nothing but a Fuck Knuckles.
by Big Polla May 28, 2020
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