Lolicon is something that doesn't belong on a kid friendly forum. It is slang for Lolita complex and has nothing to do with Lolita fashion. In other words it is something that portrays a young girl, usually around 12 or 13 in an erotic manner ie hentai. You can find a better definition here:
Lolicon - Wikipedia, the free encyclopedia although I think I pretty much covered the bases. I hope that helps.