Someone who is your friend. Or almost anyone. Can also be said to a girl.
Hey, baby, havent seen you for a while, what's layin'?
s'up, rabbi?
to grocery clerk yo, rabbi, wheresa barbecue chicken?
Fresh or frozen, sir?
A word used to describe someone who is very knowledgeable about a subject
Katie just explained so much to me about the exansion of the universe... She is so rabbi