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.
by Luke Sinak May 2, 2008
Get the poo-thirtymug. the time of day when one has to take his/her daily dump. usually after eating some sort of Mexican food.
by samsonite56 October 28, 2010
Get the poo thirtymug.