A Japanese slang term roughly equivalent to "kitty" or "kittycat" in English. Derived from "nyaa" (にゃあ) or "nyan" (にゃん), the Japanese onomatopoeia for the sound that cats make, and "ko" (子) or child, which is a commonly used suffix in names for girls and pet animals.
This nyanko is so cute!
by Gemini00 October 14, 2015
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from the japanese sound effect for "meow" ("nya" in japanese) and the suffix "ko" used exclusively in japanese girls names(i.e.: Ayako, Sachiko): A Catgirl
Nyanko was a catgirl...
by Courtney June 24, 2003
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The way someone tries to motion to have sex with them, but in a less explicit way instead of hey lets fuck! :D
hey wanna have some nyanko with me? itll be fun.
by 0nion June 30, 2003
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Half girl, half cat. Mostly a Girl with cat ears and cat tail and sometimes cat-eyes and some "cat-behavior", like purring, meowing etc~

Mostly known and used in the anime community.
She issuch a cute nyanko~
by AmySakura-Chan May 1, 2016
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