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undesireable 

a noun form of the adjective indicating someone or something that is unwanted. An undesireable is usually a foul creature that is detested by society.
Who the hell invited all these undesireables? I'm leaving.
undesireable by Michael Han April 21, 2004

Undefinable 

Ummm...

Oh, right. Unable to define.
I made it seem like this word was undefinable, for a second there.
Undefinable by Smith dux Wurd January 10, 2018

undefinable 

um... so what do i put?
if you havent figured out the definition yet then your stupidity is undefinable
undefinable by The Abbused September 28, 2006

undesizeable 

A size that is questionable or unable to guess ones dress size from a far
What size shoe do you think those are?
; im not to sure it looks bigger then a 9 Its undesizeable

While ordering in the drive thru and they ask what size would you like on the combo small medium or large and you are undesizeable ;(un sure of the size)

Indefineable 

Indefineable is a Nerd for real
Indefineable by Haqqam? March 15, 2022

UndefinedBehaviorException 

The UndefinedBehaviorException is a type of exceptions that gets thrown when undefined behavior is detected.

It has been engineered by the Stenya Development group, which has been favourite for their languages for a long time now.
Cedric: Oh noo, my program keeps crashing all the time. Can you help me, Marlon?
Marlon: Mhmm, I don't know to be honest. Have you tried to catch an UndefinedBehaviorException?
Cedric: Mensch, dat kann doch nit sayyynn, das hats behoben!
More from Urban Dictionary
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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