infinifat adjective 1noun 1forms 3 adjective1 •(informal) Extremely obese.For superfat and infinifat people, fatphobic culture is even more traumatizing. — 2020 noun1 •(informal) An extremely obese person.Because they can be a lot to remember, throughout this book I use "smaller fat people" to refer to small and mid-fats and "very fat people" or "larger fat people" to refer to superfats and infinifats. — 2020 formsinfinifats · more infinifat · most infinifat