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
Get the sleeper car mug.
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
Get the sleeper car mug.
A boring looking car that could beat a high performance car in quarter mile drag race
Lamborghini car owner: let’s see if your hunk of junk can beat my lambo

Sleeper car owner: yeah sure

*they race*

Sleeper owner: YOU JUST GOT BEATEN BY A SLEEPER CAR!

*race ends*
by Newah August 10, 2021
Get the Sleeper car mug.