What is Keybanger?
1.
A keybanger is to coast along in an manual carby'd car with the engine off pumping the go pedal 3-4 times then with the car in gear dropping the clutch causing the car to 'roll start' causing a great bang to show you mates you need a new muffler.
OMG I shouldn't have done that keybanger, I need a new muffler now eh uleh?
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To be a very attractive woman, physically and intellectually, who is both sarcastic and unlikely to have sex with you.
He wanted to ask.. 
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Someone who you do not want to talk to or know, who looks creepy and annoying, e.g. greasy hair, thin whisp of a mustache, generally loo..