Sometimes we just like words because of how they sound, and this is one of those. You can probably guess what it means – it’s the last stage of human decomposition when all the fleshy bits have gone (there are three others: autolysis, bloat (lovely) and active decay). Nice.
PS I don’t recommend a Google image search of this like I just accidentally did (especially not if you’re feeling a little bit delicate after the night before). Not nice.