A type of fish, or fishy person; someone who is cancerous to be around (or quite literally smells like fish lol)
John pushed me into the kiddie pool yesterday; he is such a koi
by Corvette55 February 28, 2021
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Koi

“Kinda over it

Tierrasanta lingo since 2003
I’m koi on that fool Buster!
by Antro September 4, 2021
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Koi is a fish and a stupid one. He has lavish hair and he is dumb. This is true. This started over him arguing over every pity thing. Wow he is stupid.
Koi is a idiot
by ImaangeMaker February 28, 2022
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Koi is a really pasive girl, she is really kind when you are kind too, even if she is not really a talker girl you can enjoy with her, sometimes she act inocent but she have some things hidden and don't try to know what she is hidding, she loves drawing and hearing music, her hair is black and usually use bows, her brown eyes don't really resalt her but she don't care about that, she knows that her name is really singular but she thinks that her name is speacial, i love you Koi
Person 1:Is that Koi?
Person 2:Yes, she is and she is my friend
person 1:I think her is a little weird
Person 2:Don't say that, she is very kind
by i need to go now September 21, 2022
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For everyones safety, do not take his fishsticks unless permitted.
Koi: hi
You: hi
by Round_Eels March 24, 2022
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A very cool person with a big heart. Loves the Elliotts, and they love them back just as much! Thank you for the serotonin. Im probably not the Elliott you made your message for, but I hope have some of the satsfaction I got from your message! Hope you're well! Heres the origional post if anyone wanted to see their post :

www.urbandictionary.com/author.php?author=koi%20%3AD
Koi :D is a awesome person who makes people named Elliott feel better :D
by 3lliott.p May 15, 2021
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Someone who is a big fish in a small pond who thinks they're fancy but are really pretty basic.
Ex. That koi boy is always popping off.
Ex. That koi girl thinks her shit is high fashion when it's five and dime
by Niafabo August 5, 2023
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