One who prepares hamburgers in a fast food restaurant, a job that is typically regarded as low-paying, monotonous, has few opportunities for advancement, and is below one's potential. I know you need cash, but I think you should focus your energy on finding a solid job rather than picking up a few bucks as a burger-flipper. A lot of people look down on a job as burger-flipper, but that's where I started, and I've worked my way up to regional manager.
n. a lowly hamburger cook in a fast-food restaurant. (see also hole digger.) If you drop out of school now, you’ll end up being a burger-flipper for the rest of your life.