Wagwoff
Used when someone you don't like / have no time for says "wagwan" - usually when they aren't from a background of using Multicultural London English and you want to mug them off in front of everyone.
Medhi (walking in the room, on a conversation he's not part off) : Wagwan guys?
Me: Wagwoff mate. *silence* *laughter at subject of insult*
Me: Wagwoff mate. *silence* *laughter at subject of insult*