This is for my soldier niggas looking in the mirror who
Sitting home scratching off serials eating cereal

from Talib Kweli (Ft. John Legend) – Around My Way Lyrics on Rap Genius

Meaning

He’s talking about “soldiers” in the struggle. “Scratching off serials” refers to removing the serial numbers from a gun so it can’t be identified, typically done if the gun has been stolen or used in a crime. “Eating cereal” refers to being poor.

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