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The supreme leader of the satanist cults at the back of every classroom.
Cultist 1: Oh great On-On, what requireth you today?
On-On: I require 15 sacrifices of blood. Mwahahahahha!
On-On by A_Manwithhiv January 24, 2022
Just generally trippin', tweakin', weird, actin' a fool, blackin' out, goin' off. Not necessarily due to drugs, though that's the obvious reference.
Homie was on one, just buggin' like I shot his mom or something.
on one by Kuahmel January 23, 2009

five-on-one 

another definition for yankin your crank
My girlfriend wouldn't put out again so I had to go play some five-on-one.
five-on-one by Doyle November 14, 2003

five on one 

A slang word for male masturbation. It refers to your 5 finers on your penis, hence 5 on 1.
Hey man, i'm horny, i think i'm gonna go do a lil 5-on-1.
five on one by The Pimp February 3, 2003

Sneak up on one cheek 

To discreetly fart while in a crowded place.
"If I sneak up on one cheek, hopefully no one will hear me fart."
Sneak up on one cheek by creedmoor November 22, 2004

going off on one 

Idiom (UK), see go off on one. To launch into a rant or lengthy discussion about some pet subject.

Might be derived from "going off on a tangent", but has more of a connotation of annoyance.
Sorry for going off on one, but I really feel strongly about this.
going off on one by Cedders March 13, 2011
More from Urban Dictionary
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
Literally "dirty" pronounced with a West Indian accent. Can also have a positive connotation, for example Sean Paul's album title "Dutty Rock".
"The girl is pretty but she corrupt and dutty!"

or, in a positive usage:

"Booya! That freestyle was dutty!"
Dutty by J Hall April 3, 2003
Word of the Day on October 1, 2026
korean word for madam, older woman
Ajumma wait a moment
Ajumma by aintnotinbutnice July 5, 2009
Word of the Day on September 30, 2026

Slop Grenade

When someone uses AI to generate a large document, slide deck, or piece of code/software and tosses it over the fence for you to deal with.
Chad: Hey Brent I sent you the new backend API change to review, it’s only 100 files changed.

Brent: he just tossed me a slop grenade
Slop Grenade by Joe Squid September 28, 2026
Word of the Day on September 29, 2026
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
After we broke up, he was floxi to me.
floxi by Dr. Geek May 13, 2009
Word of the Day on September 28, 2026
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