fatass scarlet Share definition Flag when someone is overweight, at least 300 pounds you would say they are a fatass scarlet, meaning they are obese Craig: omg look at emilyKevin: she’s so fat lol Craig: yeah, she’s a fatass scarlet for sure fatass scarlet by ayoayoayoayoayoayo January 26, 2021 Get the fatass scarlet mug.