Human excrement. Basically, when you eat corn, about 13 hours later, it comes out your ass looking the same way it went into your mouth. But, on the way out, it needs a jacket. That is what the turd wrapped around your shat out corn is. The poop keeping my old corn kernels warm is a corn jacket.
I was at a BBQ yesterday and today I birthed a corn jacket. (IE, my poop was studded with corn.)