Someone who is totally and utterly obsessed with Katy Perry and can't do anything without it reminding them of Katy Perry.
Person 1: Omg how pretty is that love heart?
Person 2: OMFG..Katy Perry had a Love heart behind her when she was performing at Radio1's Live Lounge..and When she was singing POM which is Part Of Me it had a crack through the middle..
Bisexual girls who really arent bisexual who make out with girls for the hell of it and woulnd't say the word lesbian if their mouth was filled with one. "i kissed a girl -- hope my boyfriend dont mind it"
Girl 1 "What the hell is Chelsea doing making out Molly? Doesn't she know she's straight as hell?"
Girl 2: "Ugh. It's the Katy Perry Syndrome. It'll pass."
When Katy Perry recorded he voice over the original copy of Roar she said she was going to Katy perry it, and the shit was infused with the music making the song what it is today.