The act of taking a friend's hand, and jerking yourself off with your friend's hand, leaving the semen on your penis, aging it, and eating the dick cheese
Kyle: Hey Brian, want to do The Fried Jack?

Brian: No, do you remember last time, Mom will kill us.
by Lord Headass 69420 February 28, 2020
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An Irish term used for a toilet. It was originally republican slang for the toilet as if to say they were going to defecate on the old Union Jack. It has become common slang with forgotten roots.
Where's the jacks I need to shite!

Lads stay away from the jacks, I had a rake of pints last night and I've a dose of the shits
by Cornelious Templeton April 14, 2021
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A thief called Jack Jacker, steals the car jack from the other thief, called Jack Jacker
Gunther likes tongue twisters, so he invented a new one: the jacker Jack Jacker jacks jacker Jack Jacker's jack
by mr.scallywag January 21, 2019
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Where you think you're more awesome than everyone else, and that your opinions are so right, they don't require justification and everyone else is stupid for thinking differently.
Person 1: "I disagree with you, I think the Beatles is a boy band because some of their early stuff shows especially the commercialism aspect of boy bands."
Jack: "That's wrong, obviously the Beatles isn't a boy band."
Person 1: "That's actually the Jack Fallacy, not a real argument."

Jack: "Anyone who doesn't believe in God is an idiot, there's obviously a God."
Person 2: "the Jack Fallacy."
by TessaSalem November 15, 2012
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When you grab your partners anus and whip your dick out and shove it 2 feet deep in your partners ass.
Jack: Hey niki bend over its time to do The Jack Finn.
Niki: Hell yeah...Jack Finn my ass
by Steve Yzerman September 15, 2015
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When you shave all areas of the males genital area completely bald except for the bottom 2 inches of the shaft.
Shannon says " oh my God Becky, you should have seen this guys cock he had the Jack Pine" it was like a babies bottom all over but the base was jack pine. (Jack pine is hair all over)
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