In my biker world "Rice Rocket" and "Crotch Rocket" referred to high HP/Weight ratios on two wheeled vehicles. We most commonly called them Crotch Rockets as they were not all Japanese brands. Also referred to as "Organ Donors" due to many of their driving habits and as an emergency responder, frequent picking up bodies of the highways. ---- But that's probably more information than you wanted to know!!!!