An offensively customised car. Usually older than its driver, adorned with a ‘body kit’, (stolen) alloy wheels and a loud exhaust system with an oversized tail pipe. Driven and passengered by chavs listening to ear shatteringly loud drum and bass music.
Formerly a Vauxhall Cavalier car but now any form of motor vehicle driven by chavs. Usually fitted with at least one fart pipe and sporting several months of social security payments worth of speakers (and about 10 times more than the car cost) to play hip hop gangsta rap that the occupants can't actually understand a word of. The Chavalier is normally driven with such laws of physics challenging acceleration/retardation that on stopping the car the townies inside continue to rock their heads back and forth like tortoises on speed.
"i say, what on earth is that awful sound?"
"chill out, bro, Nige just gotta new set of bins in his Chavalier"