A fartdouken is a farting technique used to gross out a friend and amuse others. It is performed after the act of a fart by taking both your hands and cupping them directly in your crotch area to scoop up a good amount of gas, then close your hands together and raise up to your mid section in a hadouken pose, then expel into your friends face and yell fartdouken!!
the act of cupping your hand over your butthole, farting into your hand, closing the hand (traping the fart inside), then releasing the fart in the general direction of a person's nose, within reasonably close proximity.
When one cups his hands in the Ryu style of a "Haduken", but simultaneously farts and thrusts the vicious ball of stink into someones face. Variations include a slap at the end, taunting about the smell, and savoring your own brand while the person keels over from the horrible odor(s).
I will fartuken your ass after a vicious meal of beans, tacos, burritos, and italian cuisine.
Hater #1: "Dude, did you see that vicious fartuken followed by a haymaker"
Fake but scared fool #2: "yeah man, the hospital drove his ass away, he might make it"