All these niggas facetious and they all standing beside me
They all will buy me a chopper if any one of you try me

from Kendrick Lamar – Black Boy Fly Lyrics on Rap Genius

Meaning

Facetious: joking or jesting often inappropriately : waggish

All of his homies got his back and are ready for whatever. You mess with Kendrick, you mess with the m.A.A.d city.

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