fatty mcdaddy Share definition Flag fatty mcdaddy is a kid with 1 dad and 28 kids ( they were all adopted). hes fat and loves mcdons especially 20 nuggs I want to be one of fatty mcdaddys kids fatty mcdaddy by religous gherkin March 23, 2017 0 0 Get merch Get the fatty mcdaddy mug. Buy Now — $32.95 See more merch