I've been doing this shit, nigga who are you?
Lil nigga, I done seen keys bigger than you

from Scarface (Ft. Lil Wayne, T.I. & U.T.P) – Big Dogg Status Lyrics on Rap Genius

Meaning

He’s a legend, Weezy Baby and “Where the hell all these new pussy rappers come from, I chew ‘em up like bubble gum, yum yum"
He’s seen packs of cocaine bigger than them. Bigger meaning better or harder. Since Wayne would have no room to talk on physical size..

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