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!