Someone who is so useless at their job, either because they suck or they can be intentionally shit, they literally grind 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.
Ruler of Lake Titicaca. Rumored to have a bunghole that gets very angry if it does not receive toilet paper. Cornholio the Great is often seen walking around with his shirt over his head and his hands in the air, chanting songs about his power, and his bunghole.
"I am Cornholio! You do not want to face the wrath of my bunghole, for I need TP!"
Butthead: Shut up, Beavis! (uh huh huh huh)
Beavis: Um, okay. (heh heh heh heh).