rabbi

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?

Rabbi

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