To take a very nasty crap. Usually explosive diarrhea. The term is derived from the sound of the poo splashing into the toilet water along with the contents of the toilet generally look like vegetable beef soup.
"Oh man, my stomach feels jacked. I think it's time to open a can of soup."
Similar to douchebag but to a much greater extent as it suggests that the diameter of the aperture or sphincter through which the "douche nozzle" would pass is roughly the equivalent of a typical New York style bagel.
Yes, that midget is a douchebag but the dude who stabbed me is a douchebagel.