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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

fauxstalgia 

Faux nostalgia. Faking old things in an attempt to recapture the feeling of times gone past, especially of technology that has passed.
Hipstamatic pictures, just like the vinyl-static added to digital recordings, is prime fauxstalgia
fauxstalgia by scotte61 December 16, 2010
Word of the Day on October 15, 2026

pajama casual 

Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.
We have a Zoom meeting in a few minutes and I’ll probably go pajama casual.
pajama casual by jrod-knows March 31, 2020
Word of the Day on October 14, 2026

funflation 

The recent boom in consumer spending on entertainment and experiences with a high demand running up the cost of enjoying of those experiences.
I’m trying to go to this Taylor Swift concert but the funflation has made it so impossible for me to afford tickets.
funflation by Dfree523 November 17, 2023
Word of the Day on October 13, 2026
A US deep south term for an alligator. Usually used in the Cajun dialect.
Take the big pirogue, I saw a huge swamp dog out there earlier.
swamp dog by Crystal Ambrose May 22, 2006
Word of the Day on October 12, 2026

Throat Sweats 

The feeling and build up in your mouth/throat of saliva that sometimes accompanies nausea.
Oh man those burritos gave me the throat sweats, I hope I don’t have food poisoning.
Throat Sweats by TacoFings420 April 23, 2024
Word of the Day on October 11, 2026
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