Okay, kiddo, the Pope Lick Monster is a creature that people say lives near a railroad trestle (that's like a big bridge for trains to go over). Some people think it's a goat-man or half-goat, half-human, while others believe it's more like a big, scary, monster.
Now, this creature is just a legend, like a story people tell, and nobody has ever actually seen it for real. But some people like to go to the trestle and look for it, even though it can be dangerous because it's a dangerous place to be.
The story behind the monster is that it used to be a farmer who wanted to make a deal with the devil. He sacrificed his goats to the devil, but then the devil turned him into a goat-man as punishment, and now he haunts the trestle.
But don't be scared, kiddo, because it's not real! It's just a fun story to tell around a campfire or with friends.