bas
pronounced bahs, with as in loss, or cross.

verb - to bas
to hang out
to leave

adjective - bas
awesome

expression - BAS!
substitute for goodbye

Can also be used as "bas session" see below
Are you guys bas-ing at his house right now?
We're bas-ing right now, what're you doing?

OK, I'm going to bas out of this place.
Bas-ing out for now, see you later.

That's bas.

BAS!

We're in the middle of a bas session, so you can come if you want to; we're just talking, sitting on a couch, facebooking, and eating some chips. It's pretty bas.