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Interjection. Not the same at "what's up" which is interrogative.

Whatup is a public request for recognition. It can be used to loudly declare one's success, something akin to "whatnowmothafucka!" (also not a question). Or it can be used as a subdued call for acknowledgement, something like "I told you so".
Example 1

*At the roulette table*
P: "It's gonna be red"
Q: "I don't know man"
*It's red*
P: "WHATUP!"

Example 2

Q: "By the way man, you called it. They broke up."
P: "whatup."
whatup by yunevor May 2, 2023

whatup wednesday 

an intimate gathering of friends and strangers that takes place on a wednesday night and generally involves a fair amount of alcohol in a small dorm room. originally created by 4 south-campus ucla students who needed an alternative to the normal thursday outing.

whatup wednesdays have been evolving, including a theme song, an official shirt that is worn on wednesdays, a constitution, and more. the goal of WW is to be recognized as another day to celebrate during the rough and tough of college life.
Guy 1: Dude did you hear about whats going on today?
Guy 2: Isn't it only wednesday?
Guy 1: No its WHATUP WEDNESDAY!

WhatUp Phunk Band 

An impossibly GAY band that no one likes.
WhatUp Phunk Band by idontknow November 8, 2003

boy what up 

a phrase used to greet other people. orig. by @kermit_nofrog
"Boy what up!!! I ain't seen you in a hot minute!!! We going hard at Club Vegas VIP tonight!!!"
boy what up by @CLUB_VEGAS_VIP December 23, 2011

so what up then

phrase indicating you would like to begin to fight a person
person 1: yeah whatever; you talk mad shit
person 2: SO WHAT UP THEN !?
person 1: SO WHAT UPPPPP !
so what up then by krisskidddd September 10, 2009

WhatPulse 

WhatPulse is a key counting program which monitors the number of keystrokes, mouse clicks and more recently the distance the mouse moves (this can be viewed in both metric and imperial (miles, kilometers, and meters)), that a person makes over a period of time. The program is not spy-ware, as it does not record the specific keystrokes, programs that do record specific keystrokes are called "key loggers". WhatPulse has a website where you can register, download, and view your stats or somebody else's stats, you can join groups and view rankings in the high-scores. Website: www.WhatPulse.org
Dude, I just got 50k KeyStrokes on my whatpulse account! That puts my team onto the top 30!
WhatPulse by Kornerius January 11, 2009
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
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