Used to describe when someone says something that is no good or to describe something that is no good, or wack.
Dan: Yo sonidk if I'm going to practice tomorrow night, I'm kinda sore from the weekend.
Mike: Man that's some previous level shit, you haven't been to practice in a month.
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