The action of "swiping" you or someone elses mo-hawk (at least 4 inches in length) vertically, in a downward motion, through the ass crack of another, ideally pants-less, individual. The desired result is a new, undesirable stench on the "shit-hawker's" mo-hawk as well as a startled, awkward, forward thrusting motion from the victim of the "Shit-hawk."
Guy with mo-hawk "That stupid fucker just stole my beer and took his pants off!!"
Other guy: "go Shit-hawk his ass!"
(mo-hawk man takes other guys advice, "shit-hawks" the beer stealing nudist, and retrieves beer and forces the nudist to leave.)