"what's up?

yo Hi to everybody in da building )) i just have free time to talk by skype. Want ya?"

Hi everybody, what's up? I have some free time to talk by Skype. Would you like to?

      = These are very bad to say in English. These are "slang", and not something to use in general English.

Saying these kind of things in most countries will get a very negative response. It is not polite to say.

      = Correct way to say it.

I hope it helps.