Boy who enjoys watching or reading yuri (romantic or sexual girl love). Girl version (and opposite) is a fujoshi.
Hey, did you know that dude was fundanshi ?

Well, I mean I'm lesbian so...
by the_seas_wine_red January 11, 2018
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Is Japanese and describes boys who enjoy Shoujo Ai or 'Yuri' (girl x girl relationships in Manga/Anime). The female counterpart is fujoshi.
This boy describes himself as fundanshi because he loves shojo ai and yuri.
by Kathy33333 July 19, 2017
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A fundanshi (腐男子, "rotten boy") is a boy who likes/loves reading mangas that depict a sexual or romantic relationship between two men.
"I heard Akio likes watching gay animes. What is that called?"

"Oh! It's called being a fundanshi. Do you think he would suggest me some BLs?"

...
by mizukiakiyama April 15, 2023
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