Mixture of Gang and Aang
A nickname for Aang and his group of friends in Avatar: The Last Airbender, also known as Team Avatar.
Person: Toph is the best member of the Gaang.
Commonly used in East London to show a feeling of sarcasm or frustration, like whatever to show you don't believe something or if you're getting told off and you're like whatever.
Mr. Teacher "Get out of my class! You've just got yourself a detention"
Boy "Gaang!"
Boy 1 "I just got on a N.A.S.T.Y mixtape"
Boy 2 "Gaang!"