When a child (usually your own, less than 5 years) makes a HUGE doodie in the bowl and forgets to flush the toilet. Then a guest comes over and uses the bathroom and sees the "beast" still floating and wonders what you ate for dinner and how bad your manners are.
Also see kidkin
"My son Jack left a kidump in the bathroom....then a date came over and saw it and nearly puked. She told me I needed to see a doctor...and said that the Lysol spray was empty."