My friend used to dine and ditch at restaurants when I was in high school, but I was too polite to do it. We'd be at Denny's and my friend would say, "you down to skip out on this meal?" I'd say, "of course I'm down" just to seem cool.
My friend would leave first, wait in the car, I'd pay for the entire meal, and thank the waiter for the great service. Then I'd sprint out of the Denny's, hop in the car, and say, "go, go, go!" My friend would say, "did they almost catch you?" I'd say, "yeah man, that was close. Punk ass server ain't catchin' me though."