Any car that's weighed down with several tons of aftermarket crap/improvements. Done well this can result in a Cool Car, especially if the car becomes really quick, or impossibly durable, or loaded with gadgets that actually do something useful -- hydraulics may be cool on a Low-Rider, but you can't exactly fight crime with them. Unfortunately, where previously the misguided customizer could only fit an 8-Track and an imitation gold steering wheel, the onward march of technology also means an ever increasing amount of pointless electronic window-dressing can be fitted into a car, resulting in a Rice Burner.