Created by buying the $1 double cheeseburger from McDonalds and having special sauce added.
It's not nearly as delicious as the original Big Mac, but hey. If you've only got a dollar, you've got to take what you can get.
employee: hi, welcome to mcdonalds, may i take your order?
mike: yes. i'd like two double cheeseburgers with special sauce.
ali: nig mac.