One of, if not the most delicious, yet underrated sodas of all time.
Friend: got anything to drink?
Me: yeah, got some Mr. Pibb.
Friend: what's Mr. Pibb?
Me: Only one of the greatest fucking sodas ever created. How do you not know about Mr. Pibb?
A sexual act when you pee in another's butt.
Guy: So do you like Mr. Pibb?
Girl: Of course I do!
Guy: When would you like me to give you a Mr. Pibb.
Guy: Great! Cause I really have to take a piss, and your butt would be a lot more convenient than going to the bathroom.
Guy #1: That girl is a PIBBie (AKA, she is not too hot, but I'd pee in her butt)