Sitting in the back with the bass on boom
Trunk gon' shake, and the wheels on zoom

from Travis Barker & Yelawolf – Funky Shit Lyrics on Rap Genius

Meaning

The music is so loud that the trunk shakes, because the bass is “on boom”

The wheels are on vroom meaning they’re drivin' quick.

yela' and travis are just bumpin' and crusin' around.

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