Top definition
The act or process of taking such a large shit that you are forced to flush the toilet half way through your deification.
Properly used in a conversation:

Dude Number 1 "Dude, I took the gnarliest Mary Pooppins after eating all those burritos."

Dude Number 2 "Dude, I want burritos"
by halffullflusher February 20, 2014
Get the mug
Get a mary pooppins mug for your brother Vivek.