Slumpus dumpus Share definition Flag When you take a dump and the shit is so big that it sticks out of the toilet and slumps over. "I just took a huge shit and it was a slumpus dumpus." -John Slumpus dumpus by Dingle cheese June 30, 2016 0 0 Get merch Get the Slumpus dumpus mug. Buy Now — $32.95 See more merch
