Used when someone is really surprised at something. For instance, when the bartender explains that they ran out of beer on tap on St. Patrick's Day, the response would be, "You've got to be kidding me!!"
a sudden reversal of fortune - a banked eight ball for the win flies out of the pocket you intended into another, or your full house loses to a straight flush on the river.
usually not part of a sentence, all you can say is "you got to be fist fucking me." or "you've got to be fist-fucking me."