YooHoo Flu Share definition Flag Diarrhea in which the consistency is that of the chocolate drink that America loves; peein' out your butt. Eating spicy foods can give you a bad case of the YooHoo Flu. YooHoo Flu by Grizzled Cheese June 28, 2010 0 0 Get merch Get the YooHoo Flu mug. Buy Now — $32.95 See more merch