An unintended action that can either result in 1.
great success or 2.
colossal failure. Made popular by
YTMND, it's a fad that is pretty much dead. Most epic maneuvers result in failure, and you'll be remembered for such actions.
Examples of an epic maneuver:
1. You're bowling and you throw the ball, but it results in a
7-10 split. On the next ball, through some miracle, you throw it and you manage to knock both pins over.
2. Let's say you're the QB in a football game. After the snap, when you're poised to throw, your fingers lose
grip of the ball and it results in a
fumble, which is recovered by the opposing team.