What's mean "Bahhh, tchê!" in Brazil?

Or "Bahhhh, tchê!"
It's a interjection for everything used in South of Brazil, mainly in Rio Grande do Sul (extremely south).

It can mean:
- Bahhh, tchê! (Nice too see you!).
- Bahhh, tchê! (I am surprise with this news!)
- Bahhh, tchê! (Fuck...)
It can occur with the "tchê" or not.
In this video you can see a BAHH INDOOR of Curitiba: I was there!
Tangos e Tragedias - Bahh indoor!

The most impressive they are outsite the stage, in the hall of the theater and people stayed in the stairs sing with then. It was my more emotional event there, and considere I got my medical diploma in this theater.