Cesspoolian Share definition Flag a waste of space on the road. Someone who doesn't know how to operate an automobile. A mutant. If this cesspoolian doesn't get out of the way, I'm going to run him off the road. Cesspoolian by freelancelot June 19, 2016 0 0 Get merch Get the Cesspoolian mug. Buy Now — $32.95 See more merch