I could tell you what it is; I could tell you what it isn’t

from Pro Era (Ft. Capital STEEZ, Chuck Strangers, CJ Fly, Dirty Sanchez, Joey BADA$$ & Kirk Knight) – Pitchfork Selector Freestyle Lyrics on Rap Genius

Meaning

Maybe this line Joey pays homage to Kendrick Lamar’s line
I can tell you what it is, I can tell you what it isn’t” from Kendrick’s 2009 unreleased self-titled song
http://www.youtube.com/watch?v=rmVlgevh-q4

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