I got the eye of the tiger, a fighter
This is perhaps a reference to Survivor’s anthemic amp-up tune.
It’s also the start of her ferocious feline metaphors. Tigresses can be feisty creatures. Rawr! Katy now has the ability to think and defend herself, and is not somebody to be messed with anymore, (a theme that also shows up in Dark Horse, another song in which Katy compares herself to an animal).
Finally, this could also be a reference to tiger’s eye, a gem that allegedly gives protection to those who wear it.
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