Someone who is so useless at their job, either because they suck or they can be intentionally shit, they literallygrind your will to live down into a tiny nubb through their absolute fuckery
We are working our arses off and that Nubbfucker Sheena doesn't do shit and gets away with 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