A Flat Jack is a square of breaded processed chicken that can be heated up in a toaster instead of an oven, making it a quick and convenient lunch option or snack food.
It's like a chicken nugget that is the size and shape of a Pop-Tart.
Hey man, I'm hungry, but I dont want to heat up the oven or turn on the stove for something small. What do I do?
Oh, no problem. Stick a couple Flat Jacks in the toaster and you're good to go dude.