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on the niner 

act of standing against a wall to cause the effect of invisibility.
Hey wheres billy. oh there he is, he must have been on the niner.
on the niner by Jarrin Dennis February 16, 2004

Forty niner 

A woman who is a 4 but thinks she is a 9
Hey bro, look at this tinder thot forty niner requiring men be 6 feet tall, 6 figure income, looking like a model, and they are broke, far and aren’t even cute.
Forty niner by MGTOW September 10, 2019

Ground Point Niner

In aviation, "ground" control is always "121" in the first three digits of the frequency. In this case, Ground point niner would be "121.900".
Boston Tower: American 1070, cross runway four left and four right via Charlie, then contact ground point niner on the other side.

minor niner 

A term used by students in grades ten and up to describe grade nines, especially those that are new to the school.
Generally identifiable by the large packs they hang around in, the lost, confused and sometimes excited or amazed look on their faces and the constant asking of directions to their classes.
See freshman
Grade Nine Student *Lost look on face*: Wheres Rm 154?
Grade Eleven Student*Looks Annoyed*: Down the hall and to the left
Grade Nine Student * Smiles *: Thanks!
Grade Eleven Student *Rolls Eyes* Whatever.
*Turns to Friends* Minor Niners
*Friends Nod in Agreement*
minor niner by k e l l bell* September 4, 2006
Dude, I just totally dropped a niner cap. It looked like a brown boomerang in the toilet bowl.
niner cap by Lazynugz April 3, 2011

Rusty Niner

A variation of the sixty-nine, except both participants are eating out the others balloon knot.
My girlfriend and I tried a Rusty Niner, but I didnt like the way her ass tasted.
Rusty Niner by Buzzzzzzz July 31, 2006
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
NYC people who migrate north to Quahog, RI to see the leaves in the fall.
New York and everyone from there can fornicate themselves with an iron stick.
leafers by ss++ February 8, 2005
Word of the Day on September 27, 2026
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