sleeper effect

The modification of a car or truck purely for performance gains, while leaving the outward appearance unchanged.

Are you going to keep the chrome tip on your performance exhaust system?

no I'm going for the sleeper effect.

by Dastoymaker December 3, 2007

sleeper dime

A good-looking person who is not given proper recognition. A dime whos looks are often over-looked.

Mary: You know, John is looking kind of fine tonight.

Jane: You're right, he's a total sleeper dime

by lia12345 May 25, 2009

Sleeper cute

a person that isnt conventionally cute/hot in personality or looks but still managed to get under the radar

That guy Jeremy is kinda sleeper cute ngl

by dork of Oz December 6, 2020

sleeper fag

A secret gay; no one knows they are gay unless they tell them

Person 1: “Hey, is John gay?”
John: “No, I’m a sleeper fag.”

by Enryu March 9, 2021

Sydney Sleeper

A piss-shooting sniper rifle in a PC game called "Team Fortress 2"
The weapon itself consists of a self-made rifle with a scope and darts soaked with piss instead of bullets

Beware guys, we have a sydney sleeper sniper on the other team!

by .aries November 19, 2016

The sleeper

The Sleeper is a form of masturbation, when one sits on ones arm for a periode of time until the arm is numb. You then proceed to masturbate.

"Deffy pullin the sleeper tongiht"
"Why would you tell me that?"

by tagger June 11, 2006

Slavik Sleeper

A group of men jizz on a sleeping woman. When she awakens, she will find a mans penis in her face.

We all got together and gave kayla the Slavik Sleeper

by Checter November 4, 2009