When you take an absolute gargantuan steamy hot watery shit (hopefully in a toilet), that typically is caused after eating Taco Bell, (and other Mexican food), this shit will be a traumatizing memory that you will live with forever.
It's called Hiroshima because this hot dihorrieah mess of a recked asshole, this massive Chernobyl explosion shit, this nuclear explosion bomb off a fart shit, should just destroy all living bacterias inside the toilet bowl, sometimes even going outside of it.
When this absolute honker of a shit erupts out of your now shredded asshole, like an atomic bomb, like a volcano, like a godly blast of extreme shit, it will destroy anything in its path, don't expect a clean butt after this, expect to have the dirtiest, shittiest, shower of your life, nothing else will get rid of it. You will smell horrible for the rest of the week, don't even try leaving your house.
Guy 1: Oh shit I think I have to go Hiroshima the toilet!
Guy 2: Fuck, call the plumbers.
Guy 3: Goddammit Taco Bell wasn't a good idea.