Poo bums Share definition Flag A way to express the annoyance of something going wrong. Usually used as a polite way of letting out frustration without swearing. Vincent: Aww man! I shot Marvin in the face! Jules: Poo bums! Poo bums by Mmmavis September 16, 2008 0 0 Get merch Get the Poo bums mug. Buy Now — $32.95 See more merch