“I got the eye of the tiger, a fighter, dancing through the fire”

Katy Perry – Roar Lyrics on LyricsMode
EXPLANATION
She is telling everyone that she's strong and that she is not gonna let anyone let her down.
EXPLANATION
She is saying that she has the power to stand up and be strong and powerful and she is big and bold now and she's fighting back of what she's been through, now she's big and bold and she has no worries now about anyone or anything now she can speak up and say what she has to say with her chest just like comparing to a tiger and also that she's happy now.
EXPLANATION
She is saying that she is not afraid of anything and she will do what she has to do.