An individual who does something unfavorable to another, ie. an individual who would do something "mal" to another. (Of Latin decent.)
by India Morgan May 23, 2008

by The Girls at LVC October 9, 2010

A hot woman walks into a bar, a guy would yell out "Red Mallard" and his buddies would know to look toward the door to check out the hot chick!!
by Wiley_Oompa April 7, 2010

Quit being a mallard!
by Fishbone2k2 October 21, 2006

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!
by Landon M. September 28, 2006

by Cody 13 April 24, 2008
