You've got to be careful when you're talking about ricers, because anyone that fits your description will invariably try to defend themselves.
Really, the most common definition is an arrogant driver with a cosmetically overdone car, but little or no actual peformance. The fact that such cars are so frequently Japanese is only a coincidence - around here, the worst of the guys drive
Neons. A ricer's usually in denial about his car sucking, too; or they hide behind it being a 'show car.'