A mans is basically a guy that is considered very attractive. It could be because of his looks or attitude or whatever. Basically, a mans is the epitome of men. It's also used satirically to
mean the opposite.
Synonyms include: dream man,
fine boy, or
Harry Styles etc.
Ex1:
Friend 1: Hey girl, what's you do last night?
Friend 2: Nothing, just stayed home.
Friend 1: Dude you need to get yourself a mans!
Friend 2: I know :( Find me one!
Ex2:
Girl: Did you see
BTS' Jimin's solo performance to I Need U at the Melon
Music Awards?
Girl 2:
Yes duuude he slayyed what a king.
Girl: Yes girl he's such a mans. My mans.
Girl 2: Haha you wish, he my mans.