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1.
When you are sure to win a game/series and miraculously choke and lose the game, defying all odds.

Source: Toronto Maple Leafs playing in game 7 of 2013 NHL Playoffs Round 1 against the Boston Bruins with 10 minutes to go and leading 4-1, and again with less than 2 minutes left and leading 4-2, start choking and lose the game and the series in OT.
"The Bruins just maple leaf'ed game 6 of the cup final! Karma's a biaaatch!"

"We've almost got this game! let's not be maple leafing it in these final minutes boys!!"
by hockey gods June 25, 2013