Riddin' dirty is the act of owning/driving a car with expensive and gotty rims. As exemplified below by Jay Z's track "On To The Next One," from his new Blueprint 3 album, Jay Z alludes to "Ride clean, I don't ever take the shoes off."
Jay Z explains how he rides his jeep clean (opposite of dirty), and he never takes the "shoes" rims off; hence riddin' clean(opposite of riddin' dirty).
driving in an automobile while having atleast a felony charge worth of illegal drugs and or unregistered firearms with you.
(sirens blaring)
dude #1: oh shit the cops.
dude #2: whats going on dude #1: load this gat
dude #2: what the fuck, why?
dude #1: cuz i'm ridin dirty
dude #2: oh....alright(loads gun and aims at the police cruiser)
1.driving with illegal substances, firearms
2. name of a UGK (underground kings) album- ugk is pimp c and bun-b from houston,tx "south texas motherfucker thats where i stay"