bumpbumpeedumper Share definition Flag When you shit your pants after the forks on your bike fail. When his bike broke in two, Jem laid the biggest bumpbumpeedumper. Should have had his forks serviced. bumpbumpeedumper by Ernie Dogde November 2, 2018 0 0 Get merch Get the bumpbumpeedumper mug. Buy Now — $32.95 See more merch