fattyfatso Share definition Flag The biggest human possible. A fuck fucking bitch. Usually female and over 720lbs. A real chonker to put it bluntly. “Oh my god its the legendary FattyFatso” fattyfatso by Destroyer or worlds November 29, 2023 0 0 Get merch Get the fattyfatso mug. Buy Now — $32.95 See more merch