A Hail Mary pass is a very long forward pass in American football, typically made in desperation, with an exceptionally small chance of achieving a completion. Due to the difficulty of a completion with this pass, it makes reference to the Catholic "Hail Mary" prayer for strength and help.
Roger Staubach, the thrower of the game-winning touchdown pass to wide receiver Drew Pearson during an NFL playoff game between the Dallas Cowboys and the Minnesota Vikings on December 28, 1975
The Catholic-inspired name of the play derives from its early use at the University of Notre Dame and its frequent fusion of religious and football imagery (such as in Touchdown Jesus, pictured above)
In several forms of football, a forward pass is the throwing of the ball in the direction in which the offensive team is trying to move, towards the defensive team's goal line. The legal and widespread use of the forward pass distinguishes gridiron football from rugby football from which the gridiron code evolved, in which the play is illegal.
A quarterback has just released the ball for a forward pass
Quarterback Roger Staubach of the Navy Midshipmen throwing a pass against Maryland just as the pocket collapses, 1964
Matt Hasselbeck of Seattle Seahawks dropping back to pass against Green Bay Packers in 2009
Tom Brady throwing a pass against the Miami Dolphins during 2009 game