Sleepday 

A sleepday is a day in which you have nothing of importance to do, and do nothing but lay in bed and sleep the entire day away. Tend to be pretty bad ass.

Nielsen: Hello, chap.
Oliver: Why, hello there. I had quite the sleepday yesterday.
Nielsen: That's fine. Why are you fucking my wife, Oliver?
Oliver: Huh?

Sleepday by YapmelkXela February 20, 2010

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.

sleeper leaper 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*

Sleeper car 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!"

Sandy Sleeper by The Ninja Shitter November 13, 2011

street sleeper

A vehicle that has been mechanically tuned for performance, but looks visually very similar to (or the same as) the original vehicle.
Street sleepers are intended to surprise race challengers who underestimate their performance.

"damn, that must have been a street sleeper, there's no other way it could have beat me!"

street sleeper by I AM Mr Smith July 23, 2012

heavy sleeper 

Sleep through a lot of noise

She's a heavy sleeper because she can sleep while the loud music is playing

heavy sleeper by Edat310 May 18, 2018

Sleeper 

The exact opposite of a ricer. A Sleeper looks stock but is heavily modified to preform better. Sleepers are often, like ricers, economy cars. Unlike ricers, sleepers can also be regualr sedans or any other vehicle that was not meant to be a preformance vehicle. Sleeper cars are ussually modified with boost (super or turbochargers), transmisions, and sometimes full engine swaps. Many people who drive sleepers use them to hustle at the strip or avoid attention from the cops. Many auto makers offer factory sleepers that are a sport version of the origional economy sedan with very few external changes. Some of the best sleepers of all time came from the muscle car era. The 1972 Chevy Nova is considered one of the best sleepers. The Nova is one of the most popular models to get turned into a sleeper. Most sleepers aren't true sleepers because they will have aftermarker gauges visible (real sleepers hide them in the glove box), racing slicks and loud pipes. A true sleeper will not be exposed until they reach the end of the track.

Chuck's 1968 Mustang GT500 got spanked by a 1960 Chevy Nomad Wagon. Chuck was the victim of a big time Sleeper when the Nomad lifted the front wheels in the air and he proceeded to see nothing but tail lights down the track.

Sleeper by northendwhitetrash September 29, 2008