Came through the door like who y'all niggas?

from J. Cole – Niggaz Know Lyrics on Rap Genius

Meaning

Cole came in the game with the intention of being the ‘Big Dog’, so as soon he got the chance, he told everyone else to get out.

Continuing with the Biggie references, Cole now alludes to Kick in the Door in which the hook goes:

Kick in the door, waving the four-four
All you heard was Poppa don’t hit me no more

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