A hiroshima
When you take a dump so big it could knock out a whole football team. It smells so bad people in the next town can smell it.
My dad had a Hiroshima after eating 10 chili dogs. The whole neighborhood ran away.
When I ate three pizzas and took a laxative, that was a full-blown Hiroshima.
My sister had a Hiroshima so strong, the dog ran out of the house and joined the army.