A pleb. Or someone annoying or just, on a very good night, a member of the public. Plural ("Cinderblocks") may be abbreviated to "cinders"
(While driving through a town at night, as you pass some townies or plebs): "Wooooooooooooaaaah cinderblock!!!"
This may be shortened to "wooooooooooah cinders", "bloody cinders", "pissin cinders", etc. as required