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seidel prediction 

A meta prediction about the progression of a story. At any point in a story, a seidel prediction can be created by making several predictions, how the story will progress, with the goal of one of them being close to the actual progression of the story. The goal of a seidel prediction is to be able to declare that one already knew how the story will go on, that it was predictable and basically boring.
A: See? I knew It! Exactly as i said it would end. The sotry was so predictable.
B: Dude, the 9 other endings you predicted did happen, what about that? That totally was a seidel prediction.
To download a file, esp. an application, to a smartphone or other electronic device outside of the accepted or usual channels.
The app center says the eBay app isn't available yet for the new OS on my phone, so I had to sideload an earlier version from a Dropbox link I found.
sideload by Eduardo Suave September 7, 2011

Bro-Sidelined 

When a bro has no interest in a female due to his bro's past or present feelings for her.
Bro: Yo, you into that girl?
Bro #2: Nah dude, she's been bro-sidelined cause of Bro #3.
Bro: Shit man, I didn't know, I'll ease off then.
Bro #3: Thanks bros.

sideline friend

A friend that is well liked by friends but doesn't get asked to hangout or get invited to things and is left on the "sidelines"
She says she likes me but never wants to hangout with me, I feel like a sideline friend.
sideline friend by bigred00 April 3, 2016

Droppin' a Seibel 

To fart with either extreme stench (room-clearing) or a fart of epic proportions
Dude i ate too much at Taco Bell earlier - I feel like Droppin' a Seibel...

Sideline Ho

"My God, after sexing Mandy, Jake went home to his wife; Guess she's his new sideline ho."
Sideline Ho by Aidenne December 13, 2008
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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