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a number four 

When two people are pooping and holding hands while doing so.
"Alex and I took a number four together in the woods last night"
a number four by Agent86 March 16, 2009

a number 1 

I'm going for a number 1
a number 1 by J_Mulu360 April 15, 2015

A number 18 

A number 18 is the value meal that I forced every fast food chain to add to their menu and have not notified them of. A number 18 is a kid's meal bag filled with french fries.
Wendy's: Hello how may I help you today?
Me: I'll take a number 18.
Wendy's: A number 8. What would you like to drink with that?
Me: No. A number 18.
Wendy's: Sir i'm sorry we don't have a number 18.
Me: Put your manager on.
Wendy's Manager: Hello? How may I assist you today?
Me: I'll take a number 18.
Wendy's Manager to worker: Oh this guy again. Just ring up 9 large frys and dump them all in a kid's meal bag. Apparently it's his idea of a number 18.
Wendy's: Would you like anything to drink with that today sir?
Me: Ketchup.
A number 18 by The Banchou June 27, 2011

A Number 3

When you poo poo and pee at the same
aka every timea person poo-poos
"yes you're excused to the bathroom Johnny"-teacher
"thanks"-johnny
..5 minutes later
classmates-"ewww Johnny did you number one or two,"
"A number 3....
bitches."
-johnny
A Number 3 by Ass Hat3321 December 14, 2010

a number on his back 

when you dont have a target on you but everyone knows to stay clear of you
you know darell, they put a number on his back although he weak he still beat a guy with 250 bodies to his name.

i’ll have two number 9s, a number 9 large, a number 6 with extra dip, a number 7, two number 45s, one with cheese, and a large soda. 

What Big Smoke orders in GTA: San Andreas.
Voice Comm: Can I take your order please?
Big Smoke: Carl, what do you want? You gotta eat to keep your strength up, man.
CJ: Ey, I’ll take a number 9, fat boy.
Ryder: Give me a number 9, just like him.
Sweet: I’ll have a number 6 with extra dip.
Big Smoke: I’ll have two number 9s, a number 9 large, a number 6 with extra dip, a number 7, two number 45s, one with cheese, and a large soda.
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
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
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