Slang suffix attached to a descriptive word to characterize a type of man, often in online or youth slang. Common in compounds like フツメン (ordinary-looking guy) and キモメン (creepy guy).
That guy is just an ordinary-looking dude, but he has a good personality.
I've been called a creepy guy before.
one's favourite member of an idol group
sidemen; supporting musicians
jazzmen; jazz musicians
linemen
From English 'men', used as a slang suffix in Japanese to create labels for types of men. The kanji 面 is an occasional ateji, but the katakana form is standard.