Get a crack valve with that bass in it

from Big Sean (Ft. Juicy J & Nicki Minaj) – MILF Lyrics on Rap Genius

Meaning

Base is short for Freebase cocaine, which is a chemically pure version with no additives. A Valve is a tube, and Nicki is substituting “valve” for the word “pipe” (crack pipe). Also, sometimes people call their dicks pipes when they have sex.

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