a big poo poo head Share definition Flag A euphemism for shithead. Usually used in a joking, lighthearted manner towards a friend. Holly: Your breath stinks. Lulu: Shuttup you big poo poo head. a big poo poo head by LuLu828 August 24, 2005 0 0 Get merch Get the a big poo poo head mug. Buy Now — $32.95 See more merch