Tryin' to get they cheese, tryin' to get they pocket so large

from Wiz Khalifa (Ft. Amber Rose & Lola Monroe) – Initiation Lyrics on Rap Genius

Meaning

Cheese is a slang term for money.
When someone says they trying to get a large pocket, it means they trying to get a lot of cash. Over-flowing cash in the pocket, would be a fat pocket.

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