They ain't wanna let me through, so I became a cop car
Put the sirens on every time I touch a pen

from Joell Ortiz – Battle Cry Lyrics on Rap Genius

Meaning

The industry won’t let him in and won’t embrace him simply because of his image or who he is. Therefore, he became a “cop car”, and like a cop car can force its way through traffic and anything else, he will force his way into the industry by the merit of his talents alone. Furthering the point, every time he touches a pen to write his rhymes, it so acts like a siren, helping to “force” his way into the industry with good rhymes.

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