fatrocious Share definition Flag Fatrocious is the same as fucken atrocious but we avoid the profanity in its use. Also used with spelling phatrocious. Oh my gosh that cat poo smells fatrocious (phatrocious). fatrocious by Asparagusjuicebox February 1, 2022 0 0 Get merch Get the fatrocious mug. Buy Now — $32.95 See more merch