An either jokingly derogatory or just derogatory way of referring to a passing trans-person. A trans person passes when they are perceived by others as the gender they perceive themselves as . A passoid is different to a voicepassoid which is when your voice passes as the gender you identify with
person 1: Uhhhhh I'm feeling really bad about myself
passoid: Its okay! don't feel to negative
person1: shut up passoid you dont know the pain
A trans person who passes but doesn't think they do on account of body dysmorphia, perfectionism, fishing for compliments, or most likely some combination of all three.
Alicenever gets misgendered but she insists that she is a massive hon. Textbook BDD passoid.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi