Usually used to describe aftermarket part added to cars. If used properly, makes a very nice deep growl. Used improperly yields a very shitty sound, like on crappy rice rockets because they think it adds 25 hp. Also see fart pipe aka fart can.
Shit, man, i like that growl.
A dirty female genitilia, someone who just looks like they have been around. They quite often are like burst open bacon sandwiches with porrige running out of them.
Cameron : " Dibs on that girl over there, she is fuckin slammin"
Mark : " No problem, bet she's got a right dirty exhaust"
Cameron : " Yeah, im gonna put my hooligan right in her exhast."