Anytime someone has an unusually green shit. Such an act is likely to take place the day after St. Patrick's Day because of the high amount of green food dye consumed.
Dude 1: Wow, I dont know what I ate yesterday, but I had a mad case of St. Patrick's Day shits this morning and got it all over the bathroom wall.
Dude 2: Holy shit! It looks like Gumby exploded in the your bathroom!
by Lionel Matson April 6, 2008
Get the St. Patrick's Day shits mug.