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

The guys around him don’t take the problems in the city seriously, and if you mess with him they’ll encourage him to retaliate with violence. 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. These ideas are tied to the next line about neighborhoods being an obstacle.

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