The woman lays on her back while you start shitting on her torso. Next, you proceed to scoot backwards to her face while saying, "beep beep beep" until you finally rest your ass hole on her mouth. This act should only be reserved for holidays or anniversary's.

When you eat dirt for the first time and leave your family to build a shack in the woods

Keeping with the spirit of the "Three River City", the Pittsburgh Dumptruck occurs when three participants, or "defacateurs" proceed to defecate or "poo" on the chest or upper torso of another participant, willing or non. Said occurance need not occur in or within the vicinity of the City of Pittsburgh.