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.

Also, he is insinuating a diff meaning for these lines than the first… He is foreshadowing what he is about to say concerning his father. People mistake street niggas for real niggas. Same one that kill with will squeal with you, meaning that you don’t have be a gangster or do crime to be real or have dignity. His pops is real and wouldn’t snitch on anybody and he’s a hardworking man. Similar to: http://www.youtube.com/watch?v=Y3iVumjnXvA

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