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(noun) A shy person.

Background: Koi is a homonym with coy, which means shy.
E: Don't be koi fish now. Call me sometime baby.
by metal fingerz June 26, 2009
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2
A type if colored carp . They're way too expensive and a part of Japanese culture.
What a pretty koi fish

I am a koi breeder
by BrineShrimpy December 15, 2017
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3
A Koi Fish is a man who gets overly attached to a girl and refuse to leave her alone when she has no interest in him. They generally become psychotic and ruin their friendships because of this. Some of them try to ruin their targets lives.
Girl1:"This guy won't leave me alone and just doesn't stop trying to ruin my life"#
Girl2:"Classic Koi Fish"
by Notamine December 15, 2017
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