Yeah, I'm kinda off cuz my guns was dirty

from Raekwon (Ft. Ghostface Killah, Inspectah Deck & Suga Bang Bang) – Mean Streets Lyrics on Rap Genius

His “gun is dirty,” meaning that it has been used multiple times for murder, robbery, etc.
He is also saying that the accuracy of his weapon is off because he doesn’t clean it, causing it to jam, have inaccurate fire, or suffer from other malfunctions

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