When you see something so excessive, amazing, horrifying, fortuitous, or otherwise awesome, that you are bereft of any other words to say.
Scott: "That guy just walked out the flaming wreckage after a car accident!"
Bob: "Holy fuck knuckles! He is still walking!"
by pokettomonsuta November 20, 2017
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When a large mexican man shoves his knuckles violently in the (mexican) females vagina, and spins his hand around counter clock wise, as if he were opening a jar of jelly. Then he takes his other hand, and opens up more space to then stick his penis in and masturbate. with both hands.
what the fuck is with these crazy boarder hoppers doing all these mexican fuck knuckles in gas stations.
by Fuckin' lol November 13, 2011
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A large, shambling retard with a penchant to have things inserted in his rectum.
"There's one of those MV Fuck Knuckle"

"Damn he's ugly"

"I know...let's go kick him in the balls"
by DroolerZig November 02, 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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