flunatic Share definition Flag a flu lunatic; someone who treats the coronavirus like it's the bubonic plague Mike: Have you guys even used hand sanitizer today?!?!?!?!Ted: Shut up Mike. Stop being a flunatic. flunatic by Chodles19 December 18, 2021 0 0 Get merch Get the flunatic mug. Buy Now — $32.95 See more merch