Hey anon, I'm the person who filled the prompt. "Trash" is recent internet slang to refer to your own fannish enthusiasm, fanwork that gives no fucks about propriety or literary or moral merit, or fans themselves. It is self-deprecating and kind of uncomfortable but I think a longer discussion of fan psychology probably belongs in the meme's general discussion post, not fill threads, especially because I'm still writing this fill (and so is another author) and I'd rather it didn't't get derailed into wank and frozen. To make you feel a little bit better about the word 'trash,' have this video of Lin-Manuel Miranda breaking it down : https://m.youtube.com/watch?v=6oQyCFOyRcA