woopsie poopsie Share definition Flag a woopsie poosie is what happens when one thinks they have to fart but they end up dumpin' in thier shorts Uh oh, thought i had to fart but i had a woopsie poopsie. woopsie poopsie by Pirate Man Dave October 20, 2008 0 0 Get merch Get the woopsie poopsie mug. Buy Now — $32.95 See more merch