Osuppai (雄っぱい) is a mix of osu (雄) which means male and oppai (おっぱい) which means boobs. So basically... man boobs.
Girl: I've searched up so much osuppai on Pixiv that my friends think I'm in the closet and it's just preposterous! It's like how a straight guy can like a girl that's a futanari. It's not gay to want your man to be busty, it's just the taste of a cultured indiviual.
by YaoiMaster9000 January 16, 2020