When someone is a damn fucking idiot. (Typically used in Australia)
Jimmy: Can Pigs Fly?
Kyle: You absolute fucknuckle!
An idiot who digs (looks) into things that should not be dug (looked) into, only to find out they're wrong about why they went in search and also in what they found.
Stupid Fucknuckle got it wrong!
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Whenever chet works on his bike he always pulls a fucknuckle.
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typically the second knuckle of your ring finger after finger fucking a womans tight puss with your pointer and middle fingers only; results from getting poo from her rectum hole on it
Celeste is great. First she slobbed my knob and gobbled the baby gravy then she licked my rusty fucknuckle clean of her week old ass mayo/ fudge stank combo. AND, I posted it on Youtube for all to see.
When a person is mad and wants to say fuck in front of a Karen or Karen's child
man: Oh fucknuckle!
Child:Huh?
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Someone who is incapable of being a normal human fucking being.
Daniel is a fucknuckle