You like to mistake a street nigga for real nigga
That same nigga that kill with ya, will squeal with ya

from Kendrick Lamar (Ft. GLC) – Poe Man's Dreams (His Vice) Lyrics on Rap Genius

Meaning

Kendrick is saying that many of our generation say that just because you’re in the streets, you’re a real nigga, but in actuality, the same dude running the streets with you will snitch on you, which shuts down his “real nigga” rep.

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You like to mistake a street nigga for real nigga That same nigga that kill with ya, will squeal with ya

You like to mistake a street nigga for real nigga
That same nigga that kill with ya, will squeal with ya