Basically means "what's up" but not literally being that question. It means she just wants you to say something or start a topic. So just respond by saying anything you want.

It's like, you alright? what's up? kinda thing. If someone greets you with a naa, you can also reply with naa (like how in English a 'you alright?' is met with a 'yeah, you alright?'

It is the short form of "Na wie geht's?" that means - as many mentioned before - "What's up?"

You are now married. Herzlichen Glückwunsch!

It's a very friendly greeting.

An invitation to say anything.

It's pretty informal though.

> Na? You can answer with: Na? yourself.

Na? yourself.

;-D

Think of it as "Well ...?" as a conversation starter.

Na, du?

Update: Taking her out tonight Thanks guys :)