one-outer

plural one-outers

1. card gamesA hand that wins after receiving the only possible remaining card that could transform it into the best hand.

   1 more example

   It is even more aggravating if you are a serious professional poker player who has just invested several hours in patiently awaiting his good hand of the day, only to have it cracked and smashed to bits by some loudmouth drunken slob who never even bothered to look at his cards, raised everything, and in the end sucked out a one-outer to beat you.

   2014, Victor H. Royer, Powerful Profits From Poker