Did I just say that?

So I was talking with a friend from the States this afternoon, and as we were saying goodbye I actually closed by saying "later, dude." I really have no idea where that came from, since I don't think I talked like that before leaving the States (or maybe I did and wasn't self-aware). I guess you can take the boy out of California, but you can't take California out of the boy.

"Later, dude"?