noun
masochistic man; male masochist
Slang term, often used in BDSM contexts. The reading エムおとこ is also possible but less common.
See also: Ｍ
彼は自分をＭ男だと言っている。
He says he's a masochistic man.
Ｍ男向けの雑誌を買った。
I bought a magazine aimed at male masochists.
Refers to a masochistic woman, the female counterpart of Ｍ男.
Refers to a sadistic man, the opposite role.
From the initial 'M' of 'masochism' combined with 男 (man).