And boy you penciled in
You're temporary, substitute and we can't fit you in, let's begin

from Big Boi (Ft. Sleepy Brown) – The Thickets Lyrics on Rap Genius

Meaning

Playing of his use of pen in his last thought, Big Boi is a permanent, legendary, fixture in the music world (written in pen). Other rappers are fads (written in pencil), and he doesn’t have any time in his life for them.

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