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crotch rocket
slang A motorcycle, often specifically a Japanese sportbike. Some dude on a crotch rocket just shot past me doing about 100.Of course I wouldn't get a crotch rocket like that—I'm a Harley man.
crotch-rocket
n. a motorcycle. (For some, only foreign motorcycles are so called.) I can buy a nice car for less than you paid for that crotch-rocket.