Sleeper 

A booty that looks like it isn't much but it's actually a hidden treasure

"Bro Tracy has a a flat ass"
"Nah bro she has a sleeper trust me"

Sleeper by Lil papaya October 11, 2016

Sleeper 

A type of car guy with a normal, stock looking car (like an everyday person would have), but the performance of it is intense; simply the undercover of the car community.

These people will

1. Focus on all go, no show.
2. Hunts down rich douchebags in their supercars, who brags about it being "faster"
3. Modify their car's performance (Turbo, Intake, tires, etc)
4. Be the most unexpected when law enforcement gets included

The imbecile in the Ferrari 360 is to late to realize the Volvo 242 with the roaring V8 was a sleeper car

Sleeper by DeadassDefs May 23, 2018

sleeper 

When you aren't sure if someone is retarded. Something just isn't right

At Megan's birthday party everyone wondered if Ben was a sleeper since he kept hitting his head against the wall.

sleeper by Guad or Ed's July 12, 2018

Sleeper 

A song that people sleep on.

Bro what’s a good sleeper?

Listen to Tink she dope

Sleeper by Ddffodk June 7, 2019

Sleeper 

Someone who you assume is just a normal guy because you only see him in hoodies and baggy jeans. Only to find out later when its summer that hes actually jacked as hell.

Friend1: Yo you know Jake?
Friend2: Yeah what about him?

Friend: Bro look at him on the beach.
Friend2: What the hell? Since when was he that jacked?!

Friend: He's a sleeper bro

Sleeper by Sleeperagent1776 March 1, 2021

Sleeper 

A part of the cab or an attachment to a semi-truck often used for loads that travel a far distance. The sleeper contains one or two beds that are of decent comfort (in my opinion) especially with blankets. For two-person trucks, there is usually a bunk bed so that you and your passenger can sleep.

Driver: "We only have an hour left, we need to go to the sleeper"
Passenger: "Ok."

Sleeper by trhsrthsrh April 7, 2021

Sleeper 

A car that looks like a ordinary car on the outside and fast on the inside.

Person 1: I drive a 2001 Honda Civic
Person 2: That isn't fast!
Person 1: That is a sleeper
Person 2: What does sleeper mean
Person 1: A car that looks like an ordinary car on the outside and fast on the inside.

Sleeper by Theguy86 August 10, 2021