Cock back my tongue like a hammer, my head is like
A nickel-plated bammer, spit forty-five caliber grammar

from Wu-Tang Clan (Ft. Streetlife) – Deadly Melody Lyrics on Rap Genius

Meaning

RZA lets fly with an extended metaphor whereby his mouth is akin to a gun. A .45 handgun to be exact (one of the most powerful available). He explains that when he speaks (cocking back his tongue) words shoot out of his head as from a nickel-plated weapon. ‘Bammer’ = slang for gun.

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