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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.
Osuppai by YaoiMaster9000 January 16, 2020
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OSUPhoenix 

Streamer, Graphic designer, Host of Winnable Wednesday, Emotional support dude and one the coolest, best, most amazing people you will ever meet!
A legend, A hero and an awesome friend. Loved by many and respected by all. Have a drink on me Mr. OSU... You rock!
Have you seen OSUPhoenix on Twitch?
Check him out for the most amazing art and graphics and definitely join his crowd for Winnable Wednesday!
OSUPhoenix by RichTheRedn3ck September 22, 2023