A play in football where the quarterback heaves a pass into a usually distant endzone without really aiming at any particular receiver. Usually the absolute last-ditch scoring option used at the end of a game (or less frequently, a half), because everybody knows it's coming and the defense can simply bat the pass down. The name comes from the canonical prayer uttered by the quarterback before launching it.
Contrast the bomb, which is (usually) thrown with a realistic, if less-than-usual, chance of being completed and at one particular receiver.