Gator-Runs is commonly a bottle of Gatorade which is at least 3 or more months over the expiration date.
Girl: Sure(drinks Gatorade)
Guy: That's seven months old, have fun with the Gator-Runs.
Guy: Man I've had Gator-Runs all day!
Girl: What the hell is Gator-Runs?!
Guy: Expired Gatorade, it makes you shit your fucking pants.