Sleeper

In online role playing games, a sleeper is a character created by a player that is soon abandoned by its player. The character technically lives on in the game world but never speaks, works or interacts with other characters because its player no longer plays him/her. As a result, the character is often deemed a "sleeper" by the active characters and ignored until he/she succumbs to starvation or some other form of character death in the game or less commonly the player has a change of heart and decides to start playing the character again.

This is how it usually goes.

A character named Argon is born or spawned into the game world.

Argon: "Hello everybody what can I do to help out around here?"

Random character: " Argon, we could use a guard to help defend the city, maybe a blacksmith."
Argon: "Okay, sure."

One or two weeks later.......

Random Character: That Argon fellow hasn't spoken in two weeks. He made a hammer and then fell a sleep. He's a sleeper sojust let him starve."

by PoppaJ81 June 30, 2015

Project Moon sleeper agent

Fans of games made by indie developer Project Moon that will appear almost anywhere if one of their triggers is said or featured otherwise, examples include but are not limited to:

Red mist, name of a prominent character
Ideal, prominent theme for a story
A black mask covering someone’s entire face, a reference to another prominent character

Despite Project Moon having a statistically smaller fanbase compared to larger fandoms, sleeper agents will arrive in large numbers almost anywhere if any trigger is detected.
The name Project Moon sleeper agent comes from the fact that these persons will activate a set of behaviour when specific triggers are triggered like any sleeper agent and are fans of Project Moon, therefore Project Moon sleeper agents.

Person 1: Grr I’m so angry at person 2 I’m going to turn them into a fine red mist.
Sleeper agent 1: Bait used to be believable- holy shit is that the Red Mist.
Sleeper agent 2: The red WHAT?
Person 3: Oh the Project Moon sleeper agents are here.
Sleeper agent 3: Everyone get in here: summon a limbillion Project Moon fans

by Xavagery May 6, 2024

Sleeper Lefty

An individual who identifies as conservative but unknowingly holds or supports left-wing political views. Derived from the term "sleeper agent."

“We need to return the
ownership of these huge corporations to everyday folks, the people who do the work. It's the only way to stop their socialist agenda.”

“Uh you might be a sleeper lefty man”

by tasimb May 29, 2025

green sleeper

Eating too many Xanax and violently vomiting on your partners chest while having sex and promptly passing out on top of your partner sandwiching the vomit between your body’s

Jake got kicked out out of Ayanna’s house because he got her with the ole’ Green Sleeper.

by Yellatmyassrealloud October 26, 2019

deep sleeper

When the homie is fast asleep with his mouth wide open so you make him take it all the way to the base and bust in his throat.

"Ew what's that in my throat?" "Tony left you a deep sleeper."

by dvdpigeon January 23, 2025

sleeper cell dick

When a normal or below average looking dude has a hella’ dick and knows how to use it. It must be both big in size and a great fuck to meet the requirement.

See also: sleeper cell fuck, when the dick just isn’t impressive.

Holy shit, Johnny is a total sleeper cell dick. That thing had to be at least 7” girth and god damn did it scrape all the right places.

by Girthmiester February 27, 2025

Sleeper hit

A type of media that found success years/months/weeks/days after its release.

Duncan Laurence’s Arcade, which is a song, is an example of a sleeper hit. It represented the Netherlands (and also their winning song) at the 2019 Eurovision Song Contest and later went viral on TikTok in 2021.

by thecharacterwannie September 28, 2022