Now if you shoot my dog, I'mma kill yo' cat
Just the unwritten laws in rap - know dat

from Jay-Z – Justify My Thug Lyrics on Rap Genius

One of the seemingly savage rules that govern the streets. If you shoot Jay’s homie, expect to see someone close to you dead.

This line references a similar line from the classic Public Enemy song “Terminator X to the Edge of Panic”.

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