Welcome to English in a Minute,where we teach you all about idioms in American English.Have you ever heard someone say,"what's up","what's up","what's up","what's up".Let's take a look at this conversation:
A:Hey,what's up?
B:What's up ?How are you ?
A:I am doing fine,thanks.
This phrase is a casual expression and is normally used when you're taking to friends,family,or colleagues.You would not want to use it in a formal business situation."What's up?"is a greeting.It's a different way of saying What's happening?When you ask someone What's up?in a conversation,it's another way to say;hello,ask how things are going,how the person is feeling.It's a common greeting used by just about everybody in America!
And that's English in a Minute.