I got a penthouse on both coasts, pH balance

from Childish Gambino (Ft. Problem) – IV. sweatpants Lyrics on Rap Genius

Meaning

This is a play on the traditional term for pH balance, which is usually applied to determine how acidic a solution is, pH in this case standing for penthouse.

In this case, to balance out the fact that Gambino already has one penthouse on one side of the country, why not get a second one on the opposite and have an equal balance?

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