Roll with niggas, who buy fifths by the fo'
And brew's by the case
This is a play-on-words. A “fifth” is a fifth of a gallon of liquor. A “fo'fifth” is a .45 caliber gun. He is saying his friends buy fifths by the fo', meaning they buy guns, not liquor, but at the same time, they also buy cases of brew, or beer.
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