fat shit Share definition Flag One who enjoys eating in copious amounts. Said phrase does not usually mean one is actually fat, or indeed a shit. Look at David chow down on those kebabs! Fat shit! Jen is the fattest of all those shits fat shit by The Fattest Shit June 25, 2006 Words you can keep railfan mug chonk mug chud mug based mug 67 mug slime mug mogging mug chopped mug thot mug glazing mug huzz mug yams mug larp mug unc mug cracked mug simp mug baddie mug bop mug lolcow mug