Synonymous with complete failure despite supreme confidence. In perhaps the biggest upset in Super Bowl history, the NY Giants defeated the heavily favored New England Patriots who entered Super Bowl XLII with a perfect 18-0 record. So sure of themselves, the Patriots filed applications to patent the phrase "19-0" and "19-0 The Perfect Season" more than a week before the game, only to have their collective asses handed to them by the Giants.
see also ryan leaf
(failing a final exam despite having an A average going in) Boy, I really went "18 and 1" on that exam.
(losing the war in Iraq despite superior force going in) When will Bush ever realize that we went "18 and 1" in Iraq?
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