I blew up before I grew up
Got introduced to the game, now I'm at they heads like crew cuts

from Lil Wayne – Blacka Blacka Lyrics on Rap Genius

Meaning

These two lines were manufactured from The Notorious B.I.G.’s first couplet of “Runnin' (from tha Police)”, (which was popularized once the verse was used for “Runnin' (Dying to Live)”:

Check it, I grew up a fuckin' screw-up
Got introduced to the game, got a ounce and fuckin' blew up

Wayne did get known at a very young age; as a matter of fact, he was 11 years old when he first signed with Cash Money Records.

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