Could use a gun son, but fuck being the wanted man
But if I hit rock bottom then I'mma be the Son of Sam

from Nas – Represent Lyrics on Rap Genius

Meaning

Nas wisely points out the futility of hyping yourself up to be some cold-blooded killer, when all that’s going to get you is the feds on your ass and rival crews that want you dead. But this isn’t to say Nas is an entirely peaceful dude. If he did ever decide to start toting a gun, he claims he would be as deadly as David Berkowitz — a serial killer who went by the name “Son of Sam” and is currently serving six consecutive life sentences for his multiple murders. Berkowitz came to fame for his murders in 1970’s New York, so it is possible this is also meant to link back to Nas' childhood.

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