Controversial, but fauxbait. It means "fake jailbait". Jailbait, of course, refers to lewd pictures of underage girls. So fauxbait is women who are of the age of majority, but strive to look as young as possible. They shave and wax, they don't eat as much as they should, and they're generally short to boot, so it looks like you're looking at a middle school kid, but it's really someone who can drink at the bar in America (21+).
Especially since Lemmy is so big on exposing the people in the Trump-Epstein files who are trafficking and abusing young women and girls, I don't want to see people posting fauxbait. It makes the whole fediverse look bad. Like we don't care about the girls, we only wanna take down the billionaires, and we only pretend to care about their extracurricular activities because it's ethical leverage.
I guess if you're 17-20, these girls are fine to you, but I'm pushing 50 and have nieces and nephews who are older than that. I like seeing grown women as much as the next guy, but if my first thought is, "she needs to put something on," she's probably too young (or is trying to look that way) and that's something I don't wanna see.