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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