Hershel is another word used to describe fecal matter (poop). Hershel is only used for the worst kinds of poops, like the one's that causes your stomach to have cramps.
Guy 1: Are you ready to go?
Guy 2: First I gotta take a mean hershel!
Example 1: Dude I got food poisoning the other night and now I can't stop hersheling.
Example 2: Your a piece of Hershel you son of a bitch.