All this shit I spit so sick, and my pockets got the mumps

from 2 Chainz (Ft. Meek Mill) – Stunt Lyrics on Rap Genius

Meaning

Sick as in cool, and mumps is an illness. So he’s saying his money is so sick (cool), it has the mumps.

also when ppl get the mumps their face swells he could be saying that he has so much money his pockets swellin'

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