But these motherfuckers talkin' crazy like they jaw broke

from Lil Wayne (Ft. Cory Gunz) – 6 Foot 7 Foot Lyrics on Rap Genius

Meaning

Imagine talking while your jaw was all floppy and broken, it’d be crazy to see.

Possibly also a Kanye West reference, who fractured his jaw in several places when he fell asleep at the wheel back in October ‘02. Kanye has been known to talk a little bit “crazy” on certain 'televised’ occasions…

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