Young boy, let his gun bang, let his nuts hang
Transition to a Lamborghini from a Mustang
Describing his young and care-free nature, and uses the comparison in cars to describe his newly acquired social status and transition through the rap game.
It is also worth noting that a Mustang is a very nice car in itself. It isn’t on the same level as a Lamborghinni obviously, but the fact that Rocky says he started off with a Mustang shows that even before he started rapping he had shit going for him (maybe through dealing, like some other rappers)
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