This part appears in 50 sets, but of particular interest is what it's supposed to represent. Is it a bag of trash, or animal faeces?
In Minifig series 19, dog sitter appears with 1x 53119 where it appears to imply a doggie doo-doo.
But it's also used in many other sets where doggy doo-doo wouldn't be appropriate/fit the theme. It also makes a good fairy cake icing.