Got to come down
I'mma wave trunk, I'mma gon show surround

from DJ Screw (Ft. Big Moe, Big Pokey, Bird, D-Mo, Haircut Joe, Key-C, K-Luv & Yungstar) – June 27th Freestyle Lyrics on Rap Genius

Meaning

When people ride around in their cars in Houston, it’s often that they have surround sound installed in the trunks of their cars, and when they’re swanging (swerving around) they like to open their trunks both to hear the music and make them “wave.”

http://www.youtube.com/watch?v=xMr0bN7gMAo

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