A phrase to show your acceptance and/or and or approval of an idea or event. Or... if used in certain situations a way of expressing your discontent caused by a person's actions, ideas, or events.
a)1: what's good my homie?

2: not much man, just been chillin.

1: that's what's up.

b) so you're gonna side with them over me, huh? That's what's up.
by KingD303 April 10, 2016
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A two letter preposition denoting a vector anti parallel to the local gravitational gradient?
What's up?
A two letter preposition denoting a vector anti parallel to the local gravitational gradient?
You're such a fucking geek!
by AnonymousBoschToo November 29, 2018
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A fucking annoying question which people answer incorrectly by saying "The sky dumb idiot" or "The ceiling" like that, it is a feeling question.
RandomGuy"What's up?"
RandomGuy2"The sky idiot"
by Karolz February 10, 2017
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A commonly used word in high schools that means "Whats going on?" "Whats good?" or "Whats happening?"

Also sometimes abbreviated as 'Sup'
Example 1

Person 1: Sup brah

Person 2: Nothin' much man. Just chillin'

Example 2:

Person 1: Yo man. help me out with dis!

Person 2: What's up?

Person 1: I need help with dis dumb english assignment!

Person 2: No worries bro. Here's my paper from last year!
by YoloMan12345 September 27, 2018
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a generlaised greeting, can be used in most situations but has only one correct response - i hate bottles
by idiot cat November 28, 2004
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The most lazy, and unoriginal way to engage a conversation. Used by people who are bored with whom they are talking to, or have nothing else to say.
by Samuek July 22, 2008
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Used to mean "she/he/you is/are very attractive and I would very much enjoy making love to you." It is derived from "A Night at the Roxbury"
Steve: What's up? What's up? What's up? What's up? What's up?
Doug: Steve, slow down.
Steve: I can't help it man, it's hottie overload.
Doug: Just pace yourself.
Steve: Ok... What's up?... 2, 3, 4. What's up?... 2, 3, 4...
by Tonberry2000 April 21, 2009
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