Fat-Mandy Share definition Flag A Fat-Mandy is someone who enjoys to sit on her couch all day watching televison and eating take out food while screaming at her child(ren) Ughhh what an awful mom, I went to her house the other day and she's a total Fat-Mandy Fat-Mandy by BrkoutKing May 17, 2011 0 0 Get merch Get the Fat-Mandy mug. Buy Now — $32.95 See more merch