vomirrhea Share definition Flag Slang for the "stomach flu". When you are vomitting and having diarrhea at the same time. Sunday I was suffering from vomirrhea, I was literally throwing up and peeing out my butt at the same time! vomirrhea by pappy#1 January 11, 2012 0 0 Get merch Get the vomirrhea mug. Buy Now — $32.95 See more merch