Bumcooter Share definition Flag Someone that is so stupid, you can’t fathom how stupid they are. Joshua is such a bumcooter for doing that. These bumcooters won’t get out of my way. Bumcooter by Redheadedfreak June 7, 2022 0 0 Get merch Get the Bumcooter mug. Buy Now — $32.95 See more merch