"Animal Style" - bun is grilled with mustard, sauteed onions instead of raw, pickles, extra "special sauce" - this can also be applied to fries
"Wish Burger" - no meat, i.e. veggie burger
"Protein Style" - lettuce wrapped around the burger instead of a bun
"Flying Dutchman" - two meat patties with two slices of cheese. that's it.
"Double Meat" = like a Double Double without cheese.
"3 by Meat" = three meat patties and no cheese.
"4x4" - 4 meat patties with 4 slices of cheese. Are you SURE you can eat that?
"2x4" - 2 meat patties with 4 slices of cheese for the fromage afficionado
"Grilled Cheese" - cheeseburger, sans meat
"Fries - well done/light" - get your fries extra crispy and brown the way you like them or mushy!
"Neopolitan Shake" - a blend of chocolate, vanilla and strawberry shakes
*Note: You can get a burger with as many meat paties or cheese slices as you want. Just tell the In-N-Out Burger cashier how many meat paties and how much cheese you want and that is what you'll get! For instance, if you want 10 pieces of meat and 20 pieces of cheese tell them you want a "10-by-20. They'll make it"