English
English Greeting: "What's up?"
"What's up?" is a casual English greeting that literally means "What is happening?" or "Is something wrong?" In practice, it's not really asking about anything specific - it's just a relaxed way of saying "How's it going?" A typical reply is "Not much." or "Nothing much, you?"
Examples
What's up?
"How's it going?" (a casual greeting for close friends - not literally asking if something happened)
Not much, just chilling.
"Nothing in particular, just relaxing." (a common reply to "What's up?")
What's up with you?
"How about you?" (a way of asking the question back)