I got that off-black Cadillac, midnight drive
Got that gas pedal, leaning back, taking my time
I’m blowin’ that roof off, letting in sky
I shine, the city never looked so bright

from Macklemore and Ryan Lewis (Ft. Macklemore & Schoolboy Q) – White Walls Lyrics on Rap Genius

Meaning

He’s probably ridin around in something like this

He’s in no hurry, so the gas pedal is “leaning back” rather than touching the floor.

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