Flatulence that emerges with such a powerful velocity and ear-shattering roar that people nearby have been literally startled to death.
I had a cousin who was a powerfarting champion who once, at Thanksgiving, powerfarted at the dinner table and some folks dropped involuntarily down into the fetal position, thinking it was nuclear war!
To defecate with such extreme force and vigor it renders one completely fatigued, yet very euphoric. It usually results in the entire bowl being coated a healthy brown. Such causes involve White Castle, grease truck food, college dining hall food.