Nigga, I get my "by any means" on whenever there's a drought

from Jay Z – Public Service Announcement Lyrics on Rap Genius

Meaning

Whenever there’s a “drought” — i.e., drugs are in short supply, Jay does whatever is needed to get his. Jay here references the famous 1965 speech by Malcolm X:

We declare our right on this earth to be a man, to be a human being, to be respected as a human being, to be given the rights of a human being in this society, on this earth, in this day, which we intend to bring into existence by any means necessary.

“Just to amplify the connection I’m trying to make between revolutionairies and hustlers, I invoke Malcom’s famous By Any Means Necessary” slogan" – Jay-Z “Decoded”

It could also be applied to when theres a drought in the rap game — no good music for a while. Jay-Z’s music means people will need the umbrellas in the next line.

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