Rock L.A. to Harlem, and if you say "Get 'em Mike G" then I got em

from Mike G – Oldie 2 [Extended Verse] Lyrics on Rap Genius

Meaning

Mike G be running through the whole country (LA and Harlem are at opposite coasts). After all, he’s the King.

The second part refers to Tyler and Pusha’s song where Wolf says,

“Pharrell said "get ‘em”, so I got 'em"

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