Acronym for- Not Bad You
Usually comes from the hick or redneck vocabulary.
(Pretty girl walking down street) Buddy says to his friend in the car, "Not bad, you!)
Bill -"hey john, how are you?"
John -Not bad, you?!
John- "Ma, What's for din?
John- "Not bad, you!"
A noob exclaiming "no" in a grief stricken way to a fellow noob.
Theo: omg i died :(
NBY = Not Bi Yet, typically refers to ladies who say that they are stratight with no bi experience.
Cath says that she's an NBY... but I'm not so sure.