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A man who gives his underage children and his friends unlimited alcohol and pornography in an unsupervised environment while he bangs the broad from the gas station in a locked room.
High school sophomore: Yo, you studying for high school finals tonight?
High School Freshman: Nah, I'm gonna go make that 8th grader Paulie give me head at Uncle Jim's
Uncle Jim by Mr p@ul December 13, 2025

Visiting Uncle Jim 

To go to a smoking spot and consume large amounts of cannabis. Usually through glass pipes and bongs.
Dude 1: Yo son, last night at the party, nearly 30 people went upstairs and were visiting uncle Jim for, like, an hour.

Dude 2: Damn dude, wish I was there.

Uncle Big Jim 

A person who supports poorly run organizations but argues that they are "light-years ahead". They then take on the name "Uncle Big Jim"
Jimjig: The San Francisco Giants are such an amazing team. Their farm system is ranked 30th in the MLB and they are 3.5 games behind the wild card.
Wise Vahe: Oh don't be preposterous Jimjig, they will never catch up to the Almighty Los Angeles Dodgers who God has blessed then with World Series victories from 2019 to infinity.
Jimjig: Well let's go Dodgers!
Wise Vahe: What an Uncle Big Jim.
Uncle Big Jim by Hayastan03 July 17, 2019

Uncle Jimmy Steamboat 

An uncle jimmy steamboat is when one gets naked, inserts a vaporizer into one's anus, lies face-down into a full bathtub of water and vape as hard as one can.
Friend: You ever had an uncle jimmy steamboat?
Me: What the fuck is that?
*moments later*
Me: n- no stop s- st- stop sTOP STOP SOTPPPSPPP!!!!! AAAAAHHHHH!!!!!!!!!

Uncle Jimmy Fingers 

When your perverted uncle repeatedly attempts to grope and fondle you at a family get together.
Mom will you please tell Uncle Jimmy Fingers to keep his hands out from under my skirt.

Uncle Jimmy

The act of sticking a spoon up someone's anus, hence the uncle in the name, and then jimmying it around so as to rupture the colon.
"Did you hear what happened to Frank?"
"Yeah man, some guy gave him an Uncle Jimmy and it almost killed him."
Uncle Jimmy by Civil Barbarian January 5, 2017