Jay-Z seems to be describing the movement of “coming out of the blocks” at the start of a sprint race
It involves gunshots (on your mark, get set, bang!) so it gets noisy
Also, Jay is referring to “blocks” of cocaine and to the fact that cocaine, a stimulant, can keep someone awake for extended periods of time.
When Jay is hustling, he’s got enough coke to keep a small town awake for days.