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1.
A cougar that is long past her prime. The last stage in the Cougar Evolution. Usually hanging out at events that sound like they will attract a younger crowd but do not. If you see an old guy wearing blue tinted sunglasses and a hawaiian print shirt in the crowd more than likely you are in Porch Cat territory.
Guy1: Dude, what's up with this party? There is nothing but Porch Cats up in here.
Guy2: I hope we brought our Sinatra collection and some Depends!
by The Michalenko January 28, 2009
 
2.
Much like a porch monkey, labeling/insulting chiggers instead of niggers.
"Look at that porch cat, eating rice, reppin' the NY hat thinking he's tough shit"
by WilkieWeagle September 13, 2008