Top Definition
The name for fans of Katy Perry. Became popular when the Hello Katy tour was announced, but has been in use long before that.
www.katyperryforum.com- Home of the KatyCats!
by katy-cat-forever August 03, 2009

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The massive followers of Katy Perry. They would take a bullet for her. You can find them on twitter, the Katy Perry Forum or wherever Katy Perry is.
"What the fuck is up with that chick, she's crying?"
"Katy Perry just tweeted her, she's obviously a KatyCat."
by FarmerKathryn November 18, 2011

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A fan of the singer Katy Perry, fans coined the term when Perry embarked on her "Hello Katy Tour".
Guy; Have you heard of Katy Perry?

Girl; Are you kidding? I'm a total Katycat!
by _blue_eyes_ March 01, 2009

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