You take a latex sleeve that goes up to your shoulder, like what they use to inseminate pigs, and you roll it in Elmer's glue. Then you sprinkle rock salt and a little bit of broken glass onto the glove so it's stuck to it. Then you shove your arm into someone's asshole and just drag your knuckles up and down along the sides of the colon. Then you shove a rat in there and cork up the ass with wine cheese. Eventually the pressure will build up and the cheese will go flying off spraying fecal matter and blood everywhere.

When you eat dirt for the first time and leave your family to build a shack in the woods

A cattle insemination glove rolled in super glue, pieces of glass, and rock salt. Used for anal fisting.