While you was lighting your purple, I was over the scripts

from Lupe Fiasco – Failure Lyrics on Rap Genius

Meaning

Lupe is a skilled playwright, a talent dating back to before he was a rapper. While other MCs were toking up, he was practicin his dramatic storytelling

Purple refers to purple haze (or some other purple strain of weed) but might also mean purple prose, a style of writing that emphasizes style over substance.

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