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The verb "to keeper" means to spam considerably and profusely, especially in the context of an internet forum.
"Boy, we really need to ban that spammer. He keepers so much that it's making a mess of these forums."
keeper by TheLoneStarr September 16, 2005
A Keeper is a person who is the best 2vs2 pilot in X-Wing vs. TIE-Fighter and X-Wing Alliance. More over, he stays up late because he is bored and fills out dumb stuff like this. Luckily, he actually lives a normal college life on the weekends. Keeper more over, challenges people to play him in previously stated LucasArts titles at www.zone.com.
That unknown pilot just scored 100k and got a 3 k/d. Must be Keeper!
Keeper by Jonathen Dough April 14, 2004
Will fuck your shit up if you come in a perimeter of 10 meters
I got tackeld by the keeper
Keeper by Rapy_Racoon September 21, 2017
A slang term for fans of the Keeper of the Lost Cities series, often shortened to kotlc. Keepers are very passionate about their fandom and ships and will get VERY angry over whether ice blue or teal is a better eye color. Keepers are very divided by who they ship with the main character.
"That guy just saw my teal eyes and attacked me!"
"Yeah, he's a Keeper."
"What?? He's terrifying!"
"Keeper as in he reads Keeper of the Lost Cities."
Keeper by Fintan Pyren April 20, 2020

keeper of the lost cities 

A book series by Shannon Messenger, following the adventures of The Mysterious Miss F., (Sophie Foster).
Me: Oh my gods, you should totally read Keeper of the Lost Cities!
Me: okay!

Keeper of the Cheese 

A term that describes someone in a position of control or having posession of valuable assets.

Quoted in Ren & Stimpy: "I'm the Keeper of the Cheese, and you're the Lemon Merchant. And HE knows it, and that's why HE'S gonna KILL us! But don't worry little missy! I'll save you!"
I have the only LCD projector in the office. I AM the Keeper of the Cheese!
Keeper of the Cheese by ENO67 March 10, 2009