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Cheats on women and lies to every single one of them. Pretty much lives up to straight J guy names being assholes!
"Man don't be A Jack!! They suck!!!"
A Jack by HeyDanisaurus May 31, 2020
A kind person who is funny and a “girl magnet”
Your a jack
A jack by Astromech0 July 16, 2022

A jack dane 

When you projectile poo all over the body of somebody's mum at their funeral
Person 1: did you hear what happend last week?
Person 2: no what happend
Person 1:that lad over there did a jack dane at Henry's mums funeral lmao
A jack dane by Gay lord69 November 27, 2020

A Jack Epstein 

an attempt at committing suicide by jumping off one's mom's balcony, but failing miserably and going on a homosexual oddysey in which one finds oneself and dates falon lewis. He hurts himself really badly.
dude! I had a bad bad day at school so i went home and pulled a jack epstein. it hurt soooooo much!!!!!

dawg somone called me an indian and i felt so bad i pulled a jack epstein.

They told me a 2 inch penis was small, so i decided a jack epstein was the way to go.

A Jack Mclean

A Jack McLean is where you break a brand new toy by accident, moments after receiving it.
Kyle! You haven't done a Jack Mclean on your brand new toy have you!?
A Jack Mclean by TMYVP June 20, 2019

a jack barnard 

When a man takes a shit on another man, slaps it, and then licks up them mess after whilst both participants are wearing clogs
Man 1: Hey babe, wanna do a jack barnard?
Man 2: Sure, but let me put down a towel first because last time you stained the walls
a jack barnard by Rhoddy February 23, 2020
More from Urban Dictionary

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
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