1. When a person angrily writes off a sports team (after they've gone down by a seemingly insurmountable score or have given up some late points), only to have said team come back and win the game in an amazing fashion.
2. A type of superstitious reverse curse.
Holy shit dude, after the Braves went down 4-0 to the Giants in game 2 of the NLDS, I posted on Facebook that they were finished! But then they came from behind and won it in extra innings! I totally rally jinxed them!