You hear my voice, your hear that sound
Like thunder, gonna shake the ground

from Katy Perry – Roar Lyrics on Rap Genius

Meaning

Katy screams at her adversary, showing him that she’s no longer going to keep her mouth shut. Like thunder, her voice will be heard.

Coincidentally, Katy has sung about a lightning in another one of her previous singles which was related to self-empowerment: “Firework”. The thunder has finally caught up with her.

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