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1.
A character from the comedic film, "Monty Python and The Holy Grail." In the movie, this comedy relief in what was already an obvious comedy spars with King Arthur of Britain and somehow ends up missing all his limbs, yet still alive (and proceeds to taunt King Arthur) This character is widely parodied and in fact, has merchandise that can be found in video stores worldwide commemorating his madness.
The Black Knight: Come back here, you yellow bastard! I'll bite your legs off!
by Fawful668 April 04, 2006
 
2.
When a guy rides a bike over to a girl's house, fucks her in the ass, and then rides his bike immediately home. (Inspired by Drama from the episode of Entourage when he says he fucked a chick in the ass and then made her ride her bike home.)
Person A: Dude, you'll never believe what I did last night.

Person B: What?

Person A: I Black Knighted Sara!

Person B: Wow, that's awesome! I've never successfully pulled off The Black Knight.
by theroots20 July 10, 2008