poo Share definition Flag usually accompanied with "winnie the." ALso, used in Star Trek allot, when you poo and don't wipe good enough, you have a Klingon, more wiping is required. Hey, do you have to poo. Nope, just smells that way because of the klingon. poo by jeff April 30, 2004 0 0 Get merch Get the poo mug. Buy Now — $32.95 See more merch