Wear and tear that the daily use of books, binders, and backpacks receive from being shoved into lockers.
"Dude, my history book has some locker burn... half of the pages are missing!"
"I'm going to need a new backpack... look at this locker burn."
"Dude, look at all your stuff! You had a locker inferno with how much locker burn you are rockin'."