dewerrhea Share definition Flag The digestive condition resulting from the.consumption of 50+ oz. Of mountain dew in one sitting. After drinking 4 glasses of mountain dew I went home and sat on the toilet for an hour with a bad case of dewerrhea. dewerrhea by adamant1 January 27, 2012 0 0 Get merch Get the dewerrhea mug. Buy Now — $32.95 See more merch