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1.
In sports betting, a back door cover occurs when the team you wagered on covers the spread in the last minutes of the game. Often times this happens when the actual game is a blow out, yet the spread or line of the game is still at play.
The Giants kicked a late field goal to give me a back door cover. They lost by 10, but covered the 12 point spread.
by Milt Deezy April 27, 2007
 
2.
When a sports team comes from behind at the end of the game and covers the spread.
The Eagles pulled off a back door cover at the end of the game last night.
by CMac211 June 04, 2006