The extreme pinnacle of terribleness reached in a given situation. Usually involves a trifecta of injury, nakedness, and drunkeness. Similar (yet vastly more extreme) than the "Shitshow", the Rapeshow Holocaust can be used in an ironic sense. It's horrifyingly painful to watch, but at the same time outlandishly hilarious. When a person defies all that you hold morally dear in an often naked and drunken display causing harm to others, you know you have witnessed a Rapeshow Holocaust.
"Last night Bob got inhumanly plastered and drove away every good looking girl at the party with his lewd gestures and remarks before getting naked and falling out a second story window."