A Poop Barge is when someone lays enough toilet paper in the toilet water so that poop will float on top of the water. Then you leave the Poop Barge floating in the water so that it creates a horrible smell. You have to do this at a house party to get the full effect.
Damn, Tommy left another Poop Barge in the toilet, and it smells like shit!!! We should not let Tommy come to our parties anymore, that shit is ridiculous.