Sneaking in nips of alcohol (generally vodka or whiskey) to a gathering, such as the workplace, sporting events, or concerts.
"Mr. Darts was riding dirty as he walked into the arena, thirsty for some Harvard football and the Jim Bean he has neatly tucked away in his back pocket."
Marcus was the only one that did not volunteer a time to drive the car on our trip since he was the only African American and he did not want to get pulled over by the cops for riding dirty.