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Y.B.S.M. 

Person 1: I'm a Y.B.S.M.

Person 2: what's that?
Person 1: A Young Black Successful Man
Person 2: That's amazing!
Y.B.S.M. by Y.B.S.M. November 30, 2014
Short for 'Back Yard Bong Session' or 'Back Yard Blunt Session'
Shane: "Rob just invited me to a quick B.Y.B.S with his new bong"
McDeev: "In his backyard?"
Shane: "Of course"
B.Y.B.S by McDeeverton May 27, 2009

Y.B.S.M. 

person 1: 'OH my gad, Y.B.S.M.'
person 2: 'What?!'
person 1: 'Your top.. there's a white liquid on it..'
person 2: 'Oh. yeah my breasts tend to squirt milk..'
person 1: 'eww.'
Y.B.S.M. by 10-year-olds May 16, 2008

Likeable YB Stan 

The most annoying YoungBoy stan, Stan, Human Being & a Person that always gives hate on the Legendary Rapper Juice Wrld and Xxxtentacion.

He has NO life, at all.
Ken: who's the most annoying person on Twitter?
Sam: Likeable YB Stan

s.s.s.o.p.g.y.b.s.d.l.t

The act of being very forgetful.
my girlfriend forgot to give me a goodbye kiss. She is such s.s.s.o.p.g.y.b.s.d.l.t

Y.B.F.S. 

Younger Brother Fat Syndrome. This syndrome affects younger brothers, especially youngest brothers in a family with all boy siblings, that are significantly heavier than their older brothers.
Did you see Johnny's younger brother waddling out of McDonald's? He's Twice the size of Johnny! What a case of Y.B.F.S.

Did you see Andrew's brother with YBFS fall down? He's so heavy he couldn't even get back up! He just rolled on his back like a turtle until some fire fighters came and helped to lift him back up!
Y.B.F.S. by Dr. STOP YBFS March 5, 2011
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
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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