So all the basements and the speakers that they play me in
Rebellion is viral, I'm the sickness that they made me with

from ForestPunk – Be Smart Lyrics on Rap Genius

Meaning

Basically everything that makes the city of L.A and essentially society as a whole crazy, also made him who he is. Or at least contributed heavily to it. So to everyone listening, as he spits sick, everything he talks about and represents is contagious, and will therefore spread to whomever plays it. Sparking a rebellion.

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