This happens when a person that you are finger fucking .....with one finger.....your finger fucking finger....gets off when you only stick one knuckle in and they orgasm.
She's a one knuckle fuck!!! I didn't even get off!!!
by JoeyBomm July 11, 2020
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When someone is about to get their lights punched out directly
"He about got knuckle fucked in the cock sucker after he said that scandalous shit"
by jonesinj December 30, 2011
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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
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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 03, 2013
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A dickhead who likes to invade everyones privacy and will happily eat cock whenever is possible. He/She talks too much and needs to be sent to South Africa to drop him/herself on his/her own head. They talk out their ass most of the time.
Look at Jackson, he's a Fuck Knuckle. Send him to India to eat rubbish. Pog.
by Ol Meanings November 05, 2020
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