the art of being incredibly promiscuous, or slutty yet doing so by going beyond the limits of most girls. I.E., wearing a decorative bra to a party, a skirt that actually shows your butt, and maybe even a rainbow colored wig.
Mary: "O.M.G., what the hell is Jamie wearing? She looks like a slut, yet ten times crazier!"
Dustin: "That is one sweet get-up. Now that's what i call doing the Katy perry! I'm gonna go over to her, catch ya later Mary."
Mary: "Wait Dustin! I thought we were here together, as a couple!"
Dustin: "We were, but you're not the one with bedazzled pasties are you?"
to "catch the katy" means to suddenly take on the essence of Katy. The essence of Katy is indefinable yet very desirable. It's dangerous, but the good kind of dangerous.
When she tried out for the softball team and started hitting home run after home run, we all realized that she had caught the Katy. I hope that one day I can catch the Katy.