male fan of boys' love comics
A male who enjoys BL (boys' love) media, typically manga or novels depicting male homosexual romance, often created for a female audience. The term is a male counterpart to 腐女子 (fujoshi). Used within otaku/fandom circles; can be self-deprecating or humorous.
He's a fudanshi and always reads BL manga on weekends.
I went to a doujinshi convention with my fudanshi friend.
Portmanteau of 腐 (fu, from 腐女子 fujoshi, 'rotten girl') and 男子 (danshi, 'boy/man'). Coined as a male counterpart to 腐女子 within otaku culture.