Fatty Matty Share definition Flag (1) A chubby to obese girl who makes up for her unattractive body with a nice personality Fat Madison was nicknamed fatty Matty she was so nice everyday I bought her Jamaican Patty Fatty Matty by EmJayee June 2, 2018 0 0 Get merch Get the Fatty Matty mug. Buy Now — $32.95 See more merch