1: One man cums into another man's anus
2: He then excretes this ejaculation into the first man's anus while he is performing a handstand
3: The man who first took the load then sucks the excrement and semen from the 'handstand' man's anus
4: This is then regurgitated on to the same man's dick while performing a blow job.
5: The pair then swap all ejaculation, excrement, and regurgitation liquids via the mouth
6: Repeat, roles reversed.
Person 1: "Dude, what did we do last night? Damn, I need a bath!"
Person 2: "I gave you dirty malay... remember?
Person 1 : "Oh yeah, that was fun!"
A sexual act performed when a male, while having sex with a female in either the missionary or more preferably the doggy style position, reaches around his backside and obtains a sizeable amount of sweat from his Perineum (a.k.a. Chode, Brum, Taint, etc.). Said sweat is then wiped upon the females upper lip, directly underneath the nose. The maneuver is completed with the male folding each of his arms to resemble wings, flapping his "wings", and vocalizing an ear-shattering "Quack-Quack".
As Brian was ravishing Krista from the rear and giving her the ultimate in sexual pleasure, Krista suddenly felt Brians finger on her upper lip. Within an instant her olfactory senses were overwhelmed by an extremely foul odor, accompanied by the loud call of the Mallard Duck and a rush of air upon her backside presumably caused by the flapping of limbs. Unbeknownst to Krista, she had received the ultimate sexual insult: The Dirty Mallard!