After too many days of breadsticks and cheese, one begins to wonder when the next bowel movement will arrive. After day 3, somewhere deep in the black chasm of your bowels lies the fabled balrog - a dormant beast no man ever wants to encounter.
Mini-Balrogs are created by typoes in Lord of the Rings fanfiction. They are not overly fond of fangirls and eat raw eggs and bacon. They generally reside at OFUM.
When a person is diggin in their own butt to get at an itch, but goes too deep and unintentionally unearths a fart and/or poop on to their own hand. Just like the dwarves of Moría.
While in the filthy Walmart bathroom, Joel was diggin in his ass to get at that itch but he was too zealous and found a Balrog.