Used to describe a meal bought from a restaurant or fast food place that digests in a matter of minutes. Results include vomit or diarrhea. The idea is that you had the food in your system for such a short time that you never really owned it, just "rented" borrowed it from the restaurant.
"Wow i barley made it to the bathroom after i ate at Taco Bell. It was a real rental."
"Lets not go to Ponderosa, I like to buy my food, not just rent it for 15 minutes."