Any of several variety of ridiculously large cars usually manufactured in the 70s or early 80s. Usually a boat is championed for it's ability to crash into things and come out with only a few scratches. Being on the recieving end of one of these monstrosities can be quite dangerous in today's medium sized cars. Of course, the main disadvantage (besides maiming others) is that large cars are notorious for being gas guzzlers.