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Mental state in which an individual only gets sexually excited by Japanese persons, no matter what they look like. Different from yellow fever in that this obsession only counts towards Japanese persons. Not necissarily related to wapanese because nihorny people just want to fuck Japanese people.
It is a combination of Nihon and horny.
Hey, Robin seems to like Asian guys. Think I might have a chance?
-Nah man, you're Chinese, and I heard she's nihorny.

Dude, how the hell did that fat and ugly Japanese guy get such a hot girl?
-She's probably nihorny.
by asnb01 February 13, 2014
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