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what's up

idiom

3 meanings of what's up

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  1. 1
    helloidiomcolloquialrhetoric
    A friendly, casual way to say hello.

    What's up, guys? Ready to play?

    He walked in, said "What's up?" to everyone, and sat down.

    Note
  2. 2
    idiomcolloquialUSwith up
    Used to ask someone what is happening or what they are doing.

    What's up this weekend? Do you have any plans?

    Hey, what's up? Are you busy, or do you want to get lunch?

    Note
  3. 3
    problemidiomcolloquialwith up
    Used to ask what is wrong or what the problem is.

    What's up? Why are you crying?

    The car won't start. What's up with it?

    Note

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Origin

Made popular by the cartoon rabbit Bugs Bunny, who asked “What's up, doc?”