Who could've known he'd grow to be a poet and not know it

from Eminem – Almost Famous Lyrics on Rap Genius

Meaning

The saying “You’re a poet and don’t even know it” is a popular phrase among school kids. When someone makes an unintentional rhyme.
In this context, he implies that as a kid he had no clear intention of being a rapper/poet, but because of his surroundings and childhood, he grew to be one without knowing it beforehand.

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