sleeper

Outwardly common looking item, that possesses something special or unique inside.

That boring looking car is a real sleeper with that big turbo hiding under the hood and nary a sticker or scoop to be seen anywhere on it.

by sageoneon March 7, 2003

sleeper

someone who secretly is badass at something but doesnt let anyone know

guy 1: im literally boutta destroy him at insert game/activity
guy2: oh no man dont do that hes a sleeper at that game/activity

by JavaLime May 1, 2020

Sneaky Sleepers

The act of ejaculating all over a friend or roommate's bed when they are out with the key being not telling them when you have committed the act till a much later date.

Can be used as a very credible threat.

"My brother didn't want to let me use his PS3 so I gave him some sneaky sleepers"

As a threat,

"Pay your half of this month's rent or i'll leave you some sneaky sleepers"

by xovut April 7, 2009

Sleeper boobs

large breasts that are cleverly hidden, most of the time

Damn Eric, Jane is totally rocking the sleeper boobs under that big bulky sweater...she thinks she's hiding them

by Dirt Rider June 2, 2009

sleeper leaper

Trucker slang, refers to a beaver or buffalo who is known to go from one semi to another, servicing the drivers. From the practice of moving between two closely-parked semis via the opened side doors of the sleepers, without touching the ground.

That truckstop is real popular, there's plenty of sleeper leapers to go around.

by Mount May 22, 2004

Sleeper car

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 9, 2021

Sandy Sleeper

Finding a homeless person sleeping in a public area, and shoving your asshole full of sand and rocks and taking laxatives an hour before. Then giving yourself an enema and shitting all over the hobo's face with sandy, rocky, bloody shit.

"Dude that guy got a sandy sleeper!"
"Aw gross!"

by The Ninja Shitter November 13, 2011