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.
Dude, that bitch loves a good Pittsburgh Dumptruck, you guys want to drink draft beer all night and shit on her?
by Joseph Edward December 09, 2007