"Pull-through" is a situation on a parking lot where you are able to park with the front of the car facing the lane (without having to back the car in); so that leaving the parking lot is a matter of driving forward without having to back the car out (minimizing the potential for accidents).
Observed at the mall this weekend:
A van parks without taking advantage of a "pull-through" situation. Cigarette smoke bellows out the door as a large man steps out, followed by his wife carrying their year-old son and another child. Just before entering the mall, he flicks the half-finished cigarette on to the street.
Perfect example of a Triple-L.*