When a turd is ejected forcibly by gas into the toilet water, spattering water on the butt.

It happens in the middle of the night when you wake up with a massive dookie pain, rush to the bathroom and don't notice the toilet seat is up. A bare butt hitting cold water at 2am usually causes the person to yelp loud enough to wake everybody in the house.

when two men's naked wet butts collide

An event which may occur anywhere from a mans middle age to his elderly age. Upon sitting on the toilet the mans nut bag hits the toilet water.

When 2 mens/womens butts accidentally press together in a locker room after both have taken a shower.

A babies due date or more specific the exact moment when the waters break and shit gets real

(1)when you have the shits so bad that the turd-el-wave splash the water out of the t-bowl
(2)The jet of water that shoots up your ass when you launch a rocket off in an airport bathroom.