Same niggas will catch a back-to-back, snatching your cracks in black

from Nas – N.Y. State of Mind Lyrics on Rap Genius

Meaning

Nas will fire two shots in back-to-back, in rapid succession (pop! pop!) at any stickup kids he sees out — dressed in all-black like a stealthy ninja — trying to steal the drug dealers' crack supply at night to ensure he is undetected.

“Back-to-back” may also refer to back-to-back sentences, often doled out for violent crimes with multiple victims.

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