I'll never be muzzled

from Wiz Khalifa (Ft. Amber Rose, Pharrell Williams & Tuki Carter) – Rise Above Lyrics on Rap Genius

Meaning

muzzled means “basically” To be restrained from expression
Tuki is saying that he will always say things and opinions Freely
(he wont be restrained)

they also muzzle dogs so they wont bark, bite, etc..

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