Any time during the day or night when one's body makes a strong suggestion for the owner of said body to engage in the act of fecal excretion; especially via the Anus.
"Oh wow, I can feel it, it's almost poo-thirty", or, "What time is it?....it's almost poo-thirty".
Ruler of Lake Titicaca. Rumored to have a bunghole that gets very angry if it does not receive toilet paper. Cornholio the Great is often seen walking around with his shirt over his head and his hands in the air, chanting songs about his power, and his bunghole.
"I am Cornholio! You do not want to face the wrath of my bunghole, for I need TP!"
Butthead: Shut up, Beavis! (uh huh huh huh)
Beavis: Um, okay. (heh heh heh heh).