decomposing rat fart Share definition Flag A class of fart above all other farts, it is the most rank and horrific fart known to humankind. I will never forget that final decomposing rat fart my father passed postmortem. decomposing rat fart by Dr Bunnygirl May 20, 2020 0 0 Get merch Get the decomposing rat fart mug. Buy Now — $32.95 See more merch