(video games) to risk using a melee attack in order to stay alive. This usually occurs when the player is low on ammunition or is due to reload, The odds of success are low but a successful attempt is often celebrated with a sigh of relief or an exuberant shout of victory.
Gamer one: " Remember that sweet flail Mary I pulled off last night? That totally won us the match."

Gamer Two: " You want a medal to go with that swelling head of yours? Get over yourself you poser."
by Knoxford English Dictionary January 12, 2015
Get the Flail Mary mug.