Top Definition
The big boobs of a girl who tries to hide them and doesn't take photos that show them off, and doesn't wear low cut shirts.
Comes from sleeper that describes a fast car that looks slow, hiding the real power of the car.
Dude, Michelle has some sleeper titties
Yea man, you would never know from looking at her Facebook.
by nananananbatman May 25, 2013

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