When someone adds their own (or another person's) name to Urban Dictionary, either to flatter said person or to insult them. Urban Dictionamers don't realize that no one will read or care about these definitions. In the end, this is just extremely irritating and fills up the voting list (although I doubt the site's moderators will care enough to stop it).
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