Said you ain’t heard about my goddamn name
Better ask around here, I’m a goddamn king

from Machine Gun Kelly (Ft. Dubo) – Cleveland Lyrics on Rap Genius

Meaning

He’s saying if you’re from Cleveland and don’t know who he is you must be living under a rock because Cleveland has mad love for the kid and everyone knows who he is.

He even iterates to him being a king in the hook!

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