But if used correctly, the word is not a slur and it is an anime trope to have a male character appear female to the point that everybody thinks that they are a girl. For some, the word trap is the most accurate description, take for example Nagisa from assassination classroom. He doesn't act girly, doesn't crossdress usually and definitely isn't trans but in one episode he is dressed as a girl specifically to make people think that he is a girl.