But just a nigga walking with his finger on the trigger

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

Meaning

In the preceding four bars, while Nas raps about his dream, producer DJ Premier takes the piano loop out and just plays the beep sound

When the beep sound goes off, Nas snaps back to reality by saying “but just a nigga walking with his finger on the trigger”

The ‘beep sound’ symbolises an alarm. Like in the morning where your alarm helps you make the transition out of sleep and in to reality.

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