I've seen niggas transform like villain Decepticons

from Big Sean (Ft. Jay Electronica & Kendrick Lamar) – Control Lyrics on Rap Genius

Meaning

A nice Transformers reference from Kendrick. The Decepticons are generally seen as the villains in the Transformers franchise.

Kendrick mentions Decepticons and not Autobots, who are generally seen as the good guys. This detail implies he’s taking a shot at emcees who have sold out to the mainstream, they’ve “transformed” into Decepticons — deceiving the fans with their sub par, sell out music.

Elsewhere, Kendrick has referred to himself as Optimus Prime:

Optimus Prime when I’m done

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