Dead Cat Dirty is when your place of residence is in such a state of disarray from obsessive hoarding and/or pure lazines, and so vile that beneath the foul debris, one is certain to find a dead cat. The presence of a dead cat does not rely on whether or not the homeowners actually own or owned a cat. Once a certain degree of filth is reached, a rotten, decomposed cat carcass instantly appears. It is still under investigation exactly how the bizarre carcasses appear, and where they come from.