Said by the character Joey from the failed sitcom Blossom whenever he saw or experienced something unbelievable.
Blossom: Joey, Six has a thing for you.
Joey: Whoa!
81👍 69👎
Another meaning, derived from The Simpsons, for What? or Come again? Or a surprise
Person A: I passed math!
Person B: Gah?
3👍 11👎