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In the game of marbles, the positioning of the clenched hand, with the thumb inverted into the clenched fingers, which propels a marble toward the target group of marbles. So called because of the hand resembling the common masturbation technique utilized by men, and because of the thumbs insertion into the "hole" resulting from the clenched position of the hand and fingers.
When I was a shorty, I was the Fucker Knuckle champion of the block.
by ken taylor January 02, 2005
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Aug 11 Word of the Day
A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.
"My boyfriend has a total case of brain worms. He told me the cat was bugged so the Feds could listen in on us having sex..."

or

"You totally stumbled over that entire sentence. Can't speak English all of a sudden? What, do you have brain worms?"
by _Jez_ October 03, 2009
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2
Belongs to the family of swear words that include parts of the human anatomy, such as 'shithead' and 'bitchface'.

It is both a noun and just a general expletive.
Voldemort: Harry, I killed your parents, and now I shall kill you. ~Struts towards Harry~
Harry: Just piss off you fuckerknuckle.

Emma: They're making 50 Shades of Grey into a film.
Hayley: Oh fuckerknuckle! Why?!!?
by Clairelikesapplejuice July 16, 2012
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3
Typically when you finger a girl up to your knuckle. Sometimes when two men try and finger each other.
EX. I got fucker knuckled last night and it felt great!
EX. David and I need to try to fucker knuckle tonight.
by It's me bitch March 14, 2018
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