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1.
A car that has high performance but intentionally looks to be ordinary or even beat up. The polar opposite of a rice burner.
Did you see that sleeper car waste the Ferrari yesterday?
by Napoleon the Clown July 12, 2006
 
2.
sleeper car /slēpər kär/ (noun): A chick that looks like a prude and seems shy, but as soon as she has a few drinks or you get her alone, she's up on in!
Dude 1: "Man, that chick I met at the library last night was a free-eak!"

Dude 2: "The chick in the frumpy brown sweater?"

Dude 1: "Total sleeper car, bro."

Dude 2: "Nice!"
by Melba_Toast July 28, 2011