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The Mystery Man 

When you know that your girlfriend is cheating on you and you can't figure out with who. That sinister fiend is known as the mystery man.
When I find out who it is, I'm gonna choke that bitch and her fucking mystery man.
The Mystery Man by D sanchez May 18, 2004

man of mystery 

this is when you are doing a girl doggy style and you pull out, slowly and quietly, then replace yourself with a dick like object or a freind, and get the hell out of there. This is to be used when your beer goggles leave you during sex. She might have started as a 10 but now she looks like a 5. The best reaction happens if you have her face a window and wave to her after you have successfully exited the house and are on your way. (this action actually classifies it as a teleporter as if you just telported outside the window)
I was so drunk last night i had to pull the man of mystery on some uggo, hahaha i got todd to get the sloppy seconds.
man of mystery by peter-mario May 29, 2008

Northwest Mansion Mystery 

S2E10 of Gravity Falls.

Pacifica Northwest recruits Dipper Pines to help rid of the Northwest Mansion of a ghost before he wreaks havoc on her fancy party.

Also the episode where Dipcifica became a possibily Canon ship.
Northwest Mansion Mystery is my favorite episode of Gravity Falls.

Mysterymania 

1. The mystery of mysteries. Somthing so mysterious not even Sherlock could take a crack at it.

2. Also can be used to name an unknown place.
1. John: Who the fuck stole my brownies?

Tyler: I don't know. Wasn't me.

Darryl: It's a mysterymania then..

2. Don: Where you live at?

Jake: In Donora, Pennsylvania

Don: That's a mysterymania to me.
Mysterymania by Bringin88 August 25, 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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