Ever since birds flew, I been spitting this wittiness
It should be considered a sickness

from Capital STEEZ – Chicago Lyrics on Rap Genius

Meaning

Clever word play at work: “birds flew”/bird flu:

-Bird Flu was an epidemic virus known as Avian Influenza

The lyrics he’s been “spitting” are so clever and have so much power, it’s strong enough to be considered a sickness or virus

And he’s been doing this with such ingenuity from the day birds learned to fly (i.e. forever)

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