The 100 x 100 isn't an official menu item at In-N-Out Burger. But rumor has it if you ask, you shall receive. Be prepared! If you do decide to demand a 100 x 100 you will get a burger that is 100 patties and 100 pieces of cheese tall, all sandwiched between two little buns. You will also get a check for somewhere around a hundred bucks. How fitting!