A rather fitting title to a headbanger who acts like a dickhead. It is inevitable to be a headbanger and a dickhead at the same time, otherwise one is not a headbanger nor a dickhead.
For more information about headbangers, refer to headbanger
Headwanker: FUCK YEAH TURN UP DA FUCKING MUSIC *Screams*
Normal person 1: That's barely music.
Normal person 2: Just let him be, he's just a headwanker.