A made-up system in which children use to steal various items from convenience stores. Used mainly by adolescent teenagers in the South, Subway System requires at least three participants, one who will talk to or distract the shop-owner, a second who will pretend to have an injury of some sort or be a lookout, and the third who steals the goods.
Haley: "Guys, Mr. Chen's Convenience Store's cameras are out!"
Carol:"Do I hear Subway System?!"
Leanne:"Yeah, girls! Let's do it! I could use some Brown Sugar Pop Tarts and Monster!"