Rap game in the fast lane, with a gas tank
Filled with half of these trash lames

from A$AP Rocky (Ft. Angel Haze, Childish Gambino, Driiky Graham & Joey BADA$$) – BET Cypher 2012: Man With the Iron Fists Lyrics on Rap Genius

Meaning

Since most other rappers are “gassed up” he uses them as fuel in his gas tank.

In the fast lane because this is where the flow kicks up a bit

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