They say that love is powerful as cough syrup in styrofoam

from Eminem – Berzerk Lyrics on Rap Genius

Meaning

Typical Shady. He doesn’t really understand love, so he compares it to the one thing he does understand: drug use. In this case lean (the drink of choice for rappers like Lil Wayne, A$AP Rocky, and Future.) And since he has built up such a tolerance for harder drugs, lean doesn’t even affect him (neither does love).

Note—

Eminem also mentions Future while referencing codeine only several bars later.

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