An individual has to shit extremely bad and holds it in for an extended period of time. When they finally find a toilet, unbuckle, place on the toilet seat, cut loose, and the shit pile in toilet resembles a mushroom cloud. Looking like cauliflower sticking out of the water.
Eric had to shit terribly bad, however McDonald's was closed. When he finally got home he unleashed a hiroshima turd. All civilians were killed upon detination.