I'm from the school of the hard knocks, you must not
Let outsiders violate our blocks, and my plot

from Jay Z – Hard Knock Life (Ghetto Anthem) Lyrics on Rap Genius

Meaning

Jay didn’t go to college nor he graduated to high school but learned everything he knows in the streets.

As they grew up fighting and hustling, they learned how to defend their hood from rival gangs and from other dealers that tried to steal their spots. Do you think you can fuck with him?.

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