What is the meaning of what's up in hindi?

You cannot translate ‘what’s up’ with the same words in Hindi. If you say the direct words, it means ‘what is on top?’. It is funny.

The best way to say it is ‘Kya haal hai?’. This is the most popular one. It is like asking ‘How are you?’.

For friends, you can also say ‘Aur batao?’. This means something like ‘And, what’s new?’. It is very friendly. Another very good one is ‘Kya chal raha hai?’. This means ‘What is going on?’.

All of these are very common. They are good for casual talk. You use them for people you know. So you can pick any of them.