This is what it means when you order 'Animal Style' at In-N-Out Burger

If you've ever visited fast food chain In-N-Out Burger, you've probably heard the term "Animal Style."

But what exactly does it mean?

Basically, it's when a burger or fries come topped with all the fixings - plus a secret sauce, of which the ingredients have never been disclosed.

Check out the mystery toppings here...