A form of faggotry so vile that it scares away light itself leaving the bringer of the faggotry and his nearby surroundings into a shroud of sodomy and all things unholy.
Usually it means someone did something unbelievably lame on purpose. Like stabbing you in the back, or eating the last pop-tarts and putting the box back in the pantry so we all expect there to be pop-tarts but then there are no pop-tarts, and thus the mission is ruined.
"There's some dark faggotry around."
"You are the master of dark faggotry!"