Drive-by you in the rain while you carry your son

from Eminem (Ft. D12) – Under the Influence Lyrics on Rap Genius

Meaning

He’ll shoot you in the rain when you’re taking your baby home cause he’s well, crazy.

This line could also means that he’s so cruel that instead of offering you a lift, he will drive by you carrying your son while its raining. Not as bad, but harsh

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