Romanian Oatmeal Share definition Flag A bowl of diarrhea, byproduct of Thai or Mexican food. "Pedro eats a filling meal of Romanian Oatmeal every day, thats what makes him so smart." Romanian Oatmeal by Spengbab February 22, 2008 0 0 Get merch Get the Romanian Oatmeal mug. Buy Now — $32.95 See more merch