Damn girl, I'm beginning to sprout an Alfalfa
Why should I wash my filthy mouth out?

from Eminem – We Made You Lyrics on Rap Genius

Meaning

Alfalfa is a “sprout” (hence “sprout”) but also the name of a character on The Little Rascals, known for his foul mouth (like an early version of Eminem)

He might also be suggesting something since Alfalfa has that signature erect cowlick.

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