Mexican Warhead Share definition Flag noun: A huge, painful turd one expels after a large meal, especially Mexican food. That burrito was really good, but I have a feeling I'm going to have to drop a Mexican Warhead in a couple of hours. Mexican Warhead by davedavedavidson September 27, 2009 0 0 Get merch Get the Mexican Warhead mug. Buy Now — $32.95 See more merch