The hadouken, originally Ryu's special move in Street Fighter, is now an intricate sexual move involving a can of hair spray, a Zippo lighter, and an orgasm.
Directions: While doing a girl from the back, right as you orgasm you have to line up the Zippo with the hair spray, thus spraying a large fireball toward the back of her head. At the moment of incineration, you must yell out "HADOUKEN"!
"Hey dude, where's your girl??"
"Oh, she's still in the hospital... I totally gave her a hadouken last night!"
"Oh snap, does she have any hair left??"