Bro: The fuck you want?
Thirsty Hoe: What's up? ;)
Bro: Not much, chillin' WTB
Person 2: Wow, you must have had W.T.B.S
An accidental boner that occurs in the most unlikely or unexpected of times. Generally occurs in class while dreaming about girls, teachers and occasionally... cats.
Guy 2: WTB.