what's up

A question that means "hi" or "What are you doing"
It can get annoying, but people don't seem to understand that.
The best way to answer is "I think it's the opposite of down" if you are annoyed by this question
by The Billionth Random Monkey December 15, 2014
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what's up

see also: whazzup, whassup, whasabi!!, etc.
1. Hi
2. Wtf is wrong with you??

It's probably originated from the late 20th century, when people were astounded with the sky. The only thing that they would reply was "nothing"

Probably the first term to the decline of western civilization
1. Person 1: What's up?
Person 2: "Nothing" (most common response, maybe 99% of people say that)

2. Person 1: What's up?
Person: "The sky" (smart alleck answer: also: "the ceiling" or, "da roof")
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what's up

Possibly derived from "what's the update." Extremely overused, almost exclusively by America's youth.
Sometimes I wonder why people always ask each other the same question over and over again, when answer is always "nothing." Are we really that dull?
Mike: What's up?
Matthew: Nothing. If you ask me again I'll roast you.
by Renaissance Woman 4 u January 09, 2005
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what's up

what's up
by XOXO, IG August 18, 2019
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what's up

A question about what another has his attention on. What is he thinking about or busy with? "Up" in this usage is referring to a slag from around the 1930s meaning: occupied with or busy with.
When I saw him he was angry so I asked "what's up?". But he would not tell me what he was angry about.
by Scottmana September 15, 2007
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what's up

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 30, 2018
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what's up

An interrogative expression used to request a clarification or repetition of something previously said. Used in place of "what?"
Person 1: "You're not paying attention to me."

Person 2: "What's up?"
by Ian May 03, 2004
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