"What gives"? an another oft-heard expression?

Hi guys,
I have heard this so many times in many sitcoms.
I'd like to know wut that means. I did search on this word in your archives but only words related with "what" came up.

Thanks!

Are you sure you weren't looking up "wut gives?"
"What gives?" is slang, widely used as a conversation opener, meaning the same as "what's up?" or "what's happening?" or "what's new, how is the world treating you?"