She doing line after line like she’s writing rhymes

from Macklemore and Ryan Lewis (Ft. Macklemore & ScHoolboy Q) – White Walls Lyrics on Rap Genius

Meaning

Cocaine is a powder substance which is often broken into lines before being snorted.

His hoe is blowing line after line without stopping.

When writing rhymes most artists go in a line-by-line sequence.

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