B.T.U meaning bet that up, you say this when your gonna get revenge on someone or your agreeing to do something together and your lowkey excited about it.
Bro#1: Hood bro im bouta come scoop you we finna hotbox.
Bro#2: Ight B.T.U my guy
Or
Brother: OMG ON GOD WHO ATE MY LEFTOVERS!!!
Sister: I Did
A slangified vocalization of the popular Internet-communication abbreviation "btw," which stands for "by the way." The "dubs" is a shortened "double-u," which takes too long to say.
"That, b t dubs, is why I am always careful in the bathroom at the Cedar Tavern."