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Gym sleeper 

Much like a sleeper car, a gym sleeper is a person who doesn't look like or you didn't expect to move alot of weight at the gym.
Bro, did you see Bryan?? He's a gym sleeper! I didn't think he can lift that much since he doesn't look like it!
Gym sleeper by Giant_organism February 15, 2022
Often reffering to what appears to be a ordinary looking stock commuter car that is anything but stock under the hood. Pretty much the exact opposite of your every day riced up civic.
My bone stock looking 1967 Volkswagen Beetle with a dual carbed, big bore and race head equiped engine gives quite the ego bashing when a ricer can't hold up to his own challenge at a light.
sleeper by VWtuner June 6, 2003

sleepers 

Large, beautiful breasts that are keep well consealed and initially appear to be much smaller and less impressive than they actually are until unleashed.
I think Alicia may have some real sleepers.
sleepers by KABT November 13, 2007
Word of the Day on August 9, 2021

Sleepeyz 

a lord who is non binary with all the girls he could ever wish for . WE MUST PROTECT HIM AT ALL COSTS . HE IS THE CHOSEN ONE!
wait! how could we forget? we almost forgot to pray to lord sleepeyz!
Sleepeyz by joedadnevercameback December 27, 2019

sleepdrunk 

being in a state, where you are so tired, you start behaving as though you are drunk; eg. talking nonsense, unstable walk, forgetfulness, etc.
I am sorry, I just can’t think straight right now; I am so sleepdrunk.

sleeper cell 

A sleeper cell is a person who remains a dormant member of a group while belonging to another group for undisclosed reasons. Usually the sleeper cell status is kept a secret.
Those terrorists pretending to be normal students were the ultimate sleeper cells.

Why didn't you tell me you were half Asian? You're such a sleeper cell!