Though he packin' that muscle, I'm addicted to brain
This is a clever line. In high school, jocks with the muscle tend to get picked over geeks with the brain.
Nicki’s man has muscle, but she doesn’t care about that so much. She’d rather have a man with intellect.
Given the second meaning of brain (slang for oral sex), though, what she probably really wants is no a smart guy, but rather a man who can pleasure her orally.
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