Where fakin' emcees get caught with the 40-bottle
Or get their chains snatched, pronto

from Hieroglyphics – You Never Knew Lyrics on Rap Genius

Meaning

If fake MC’s don’t get harassed by cops for trying to act hard by drinking in public obviously, real gangsters will just straight up jack them.

On the other hand, Opio could be describing a fake emcee getting physically hit with a 40oz bottle. For instance, if he’s bad on stage and someone through it at him. Or if he’s fronting and someone breaks it over his head.

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