You ain't cop that piece from the district, you copped that from Fordham

from Smoke DZA (Ft. Sean Price) – Fuck Your Mother Lyrics on Rap Genius

Meaning

The district refers to LA’s jewelry district and Fordham is a New York City jewels supplier.

Someone is claiming to have been to LA to buy jewelry, and DZA puts them in their place as a local nigga.

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