1) An unstoppable force of stupidity; something not to be fucked with due to its retard factor; something so fucked up that it's best to give it a wide berth.
2) A person so fucked up that they will derail themselves with their own moronic actions; someone who doesn't need assitance in fucking up their life; a poor decision maker.
3) A catchphrase: "Nobody fucks with the Fuckshow!" Usually said by those who don't realize that being a Fuckshow is bad.
origin: Words uttered by a degenerate just before he exacted justice on a drunken hobo who was touching the hood of his minvan. After decimatingthe hobo and leaving him bleeding on the ground, the "Fuckshow" as he liked to refer to himself, purchased a 24 pack and left the scene. The hobo later died in hospital, and the "Fuckshow" ended up in prision, thus encompassing all it means to be a Fuckshow.
4) A self deprieciating term made by someone who knows that they fucked up bad.