ryearrhea Share definition Flag The phenomenon of loose stool following a night of hard partying involving rye or whisky - particularly R&R. We were hitting 'er hard last night and I woke up with a mad case of ryearrhea ryearrhea by nanas_ July 22, 2007 0 0 Get merch Get the ryearrhea mug. Buy Now — $32.95 See more merch