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underbugger 

A person or annoyance that gets under ones skin and bugs them.
That squeaky door is a real underbugger. I think that new girl is an underbugger, she wont shut up.
underbugger by Christopher Evans August 2, 2008

Undercutter 

Someone who tries to steal your business by offering the same service/product for less money.
Javi Rox: Yo, I got these cheeseburgers! I sell them to you for a dollar!
Jay Nyce: I got those same cheesburgers for 50 cent!
Javi Rox: I hate that motherfuckin undercutter.
Undercutter by Domexicano March 17, 2005

underbutt 

The distinct area off the bottom that is at the lower part of the gluteus maximus. Usually the underbutt is highly regarded in terms of attractiveness. Often the underbutt is discovered at the beach when womens bikinis do not cover the whole area of the bottom.
Amy has an excellent underbutt
underbutt by bicbiq December 28, 2008

underbuttoned 

when a man leaves too many buttons undone so chest hair is sticking out
alberto: what do you think, am i under buttoned?
rosita: you could make a wig with all the chest hair i can see - when not wearing a tie, two buttons or more is underbuttoned
underbuttoned by desmian March 21, 2022

Underbutt 

When girls wear short shorts and you can see the bottom part of their butts.
Damn did you Ashley's shorts? Her underbutt is completely exposed, and it caused me to bust an instant nut.
Underbutt by Tinnysman July 11, 2018

underbutt 

The second butt created below the original butt by tight underpants, where the elastic is doing all the work, under tight pants.
in my jogging tights i have an underbutt and a muffintop and in between is my ba-donka-donk
underbutt by tiffawiffa April 21, 2009
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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