I'm getting brain, she sucking dick, that's what I call intelligence

from Juicy J (Ft. A$AP Rocky & SpaceGhostPurrp) – Real Hustlers Don't Sleep Lyrics on Rap Genius

Meaning

Juicy J plays on the brain (i.e. dome) and intelligence, in his literary masterpiece, A Zip and a Double Cup

I dont' go to college but the dorm room is my domain
Full of pretty bitches show me how they use their brain
They sucking dick for homework, getting that dome worked…

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