You number 1, I’m number 23, my mission is take over the game

from Big Sean (Ft. James Fauntleroy, Kendrick Lamar & Royce Da 5'9") – 100 Lyrics on Rap Genius

Meaning

He’s saying you being in the #1 spot will only make him work harder. He’s also saying he’s #23 cause he’s the Michael Jordan of the game and therefore essentialy the best. (Michael Jordan’s jersey number was 23.)

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