deathfat adjective 1noun 1forms 1 adjective1 •(slang) Morbidly obese.it's made of people you probably see everyday^([sic]) and don't even think are fat, let alone deathfat. — 2009 noun1 •(slang) A morbidly obese person.The protagonist is aligned to the abject in this room as she wears her dress of rot but she is also aligned to the "death fats" and she exists at a great distance from the slender angels above. — 2016 formsdeathfats