Shootin ten millimeters of thoughts, thats just my peace of mind

from Pro Era (Ft. Ala Sole, Capital STEEZ, CJ Fly & Kirk Knight) – Bun N Cheese Lyrics on Rap Genius

Meaning

His piece (in street terms piece means gun) hence his piece of mind … shooting piece of mind.

Actually Kirk could be referring to syringes in “shooting 10mm of thoughts,” as he mentions Heroin later on in the verse.

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