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A verb. The act of being a sneaky creeper, sometimes unknowingly. Can be one with surroundings and often has the element of surprise.
Roommate 1 sees other roommates across a crowded room and txts you "I sneep you!"

Roommate: "Sneeps! Didn't even see ya there!"
Sneeper: "Yeah I've been here all day"

Sneeper: "Do you always wear panties to bed?"
Roommate: "Not after that comment...I'll be wearing my chastity belt now"
sneeper by bffleeeeee February 4, 2010

Peep Sneeper 

- a pervert who sneaks peeps in children's windows
Mary saw the face of the peep sneeper before he ran off!
Peep Sneeper by Gatordaddy October 14, 2022
The discreet sneefer crept around in the night smelling bike seats hoping to sniff some sweet, sweet puss.

sleeper hit 

Generally any type of media that is marketed as under the radar, yet is of quality to have been a top tier marketing tool.
"That game is definately a sleeper hit, easily worth my twenty dollars!"

Late Night Street Sweeper 

When your friend ejaculates on his female counterparts torso, and then a second party enters and unknowingly kisses the torso of the same female. Thus resulting in the first male's semen in the second's mouth.
Man, Russell was a Late Night Street Sweeper last night with Jim and Alice.

sleeper car 

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?