rat rod
1. a hot rod that has been pieced together by junkyard parts.

2. a sort of "sleeper" car in which the looks of the car are actually downgraded to give the car an old beat up look, when it is in fact a fast car.
1. that rad rod was a total rust bucket and looked like shit

2. jimmy tried to race a crappy old civic last night and got smoked, it musta been a rat rod.