Still making money off the white girl - Fergie

from Yelawolf (Ft. Juelz Santana) – Mixin' Up The Medicine (Remix) Lyrics on Rap Genius

Meaning

White girl is drug slang for cocaine — and the female singer Fergie is a white girl and another synonym for cocaine.
Meek Mill & Rick Ross have used Miley Cyrus and Justin Bieber as synonyms for white girl/boy aka cocacine in Believe It.
So what Juelz Santana says is that he makes money off selling cocaine.

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