“I stood for nothing, so I fell for everything”
Katy Perry – Roar Lyrics
She fell for the I's trick (Illuminati) and now she realizes what it is.
She is saying that she did whatever she did for nothing and that she was sick of it so she just did what she feels like now.
She is trying to say that she didn't exactly feel like she meant anything,
"I stood for nothing"
Because of this, she never realized that there was a catch, or a trick.
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