Arbyrhea Share definition Flag A bad case of diarrhea caused by eating too many Arby's Roast Beef Sandwiches in one sitting. After eating 5 Beef and Cheddars I came down with a terrible case of the arbyrhea. Arbyrhea by Rick Rude April 9, 2014 0 0 Get merch Get the Arbyrhea mug. Buy Now — $32.95 See more merch