24's

This song is about 24 inch rims, cars, and drugs. Some lyric interpretation:
"Money, hoes, cars, and clothes, that's how all my niggas roll"- Describing the life of T.I.'s friends.
"Blowin' dro on 24's"- smoking hydroponic, or homegrown, marijuana while in the car.
"I been driving a drop-top Chevy with the roof wide open" - He's driving a convertible Chevy.
"454 SS, I race Porsches!"- T.I. is probably driving a '70 or '71 convertible Chevy (probably a Monte Carlo) SS (Super Sport) with a 454 cubic inch V8 (a Corvette engine).

It was featured in the video game Need For Speed: Underground although some words were replaced or censored to keep the "E" rating on the game.