Boo Poo Share definition Flag When somebody scares the shit out of you while pooping. He was in there reading a magazine when I jumped out of the shower and boo pooed him. It was an instant evacuation. Boo Poo by Jepusmc September 6, 2013 0 0 Get merch Get the Boo Poo mug. Buy Now β $32.95 See more merch