Texas pinstripe

The stripe produced on the side of one's car after dipping tobacco and unsucessfully spitting out the window, away from the car, while driving. Spitting out of the window without hitting the car is a hard skill to obtain, so the stripe usually builds up over time if the car isn't washed frequently.

Wow! Look at the Texas pinstripe on his truck! He must go through at least 3 cans a day!