It's somethin on the chest cause none of my niggas rest (none of them)
Graveyard shift; my guns with the laser spit

from Styles P – Green Piece of Paper Lyrics on Rap Genius

None of his friends ever seem to lay back. The Graveyard shift refers from working the late hours of the day, all the way to the early hours of the morning. And if you’ve ever sold crack, you’d know that crackheads don’t ever sleep, so crack dealers usually stay up for prolonged periods of time distributing. He’s also saying that his gun is spitting (shooting).

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