easy...it's a nickname for..BATMAN!

A variation of the bat wing, a Dark knight is a surprise attack where one waits in a dark room streches their scrodum with one hand, while using the other hand to shine a flahlight on the scrotum for all to see.

typically though of, as evil. whether he is or not, is uncertain. definitly menacing.

Dark Knight is the coolest dude alive. His insane skills both on and off the computer amaze and astound all, especially the ladies. Can frequently be found on comic message boards hitting on other men's girlfriends and underage girls from Canada.