The act of using your pant leg as a sling/chute to fling feces onto the face of an enemy or anybody else. This is achieved by intentionally passing solid waste, while having gone commando in a pair of jeans or pants. The lack of underwear will lead the solid waste to travel down one pant leg. Once this is done, you lift your foot and kick at the air in front of them. This achieves the effect which earns its name from the snowman-like appearance lent to the victim by the feces; lumps of shit peppering their face much like lumps of coal on a snowman.
I went to a Bill Hicks show and that bitch ain't funny no more. So, I go's to talk to him after the show. Bitch reaches out to shake my hand and I gived him a Cleveland snowman, straight-up. Holla!