8
Originated in Philadelphia circa 1998. When discussing events that are of intrest to both parties. The person that didn't know what was going down would say that's what's up.
usally rhetorical.
Frank:Yo! There's a big concert at the spectrum tonite?
Jonny: that's what's up!
by HRM SMK April 02, 2008
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9
Girl: I think we better off friends...
Guy: Thatz Whats Up?
by banginbootagurl May 26, 2004
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He's warmer than you think.

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10
Person says: "Yo, I just got this/these hot new (shoes, job, CD, car, etc.) You say: "That's what's up!"
by Amber Ivy October 06, 2015
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11
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 June 16, 2016
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12
by Dildo August 04, 2003
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