be one and done

1. To finish after having had, done, or completed only one thing. A: "Another beer, John?" B: "No thanks. I'm one and done tonight." Despite their fantastic regular season, the Owls are one and done in the playoffs, thanks to today's 12–3 loss. You guys can go again, but I'm one and done with that roller coaster. I don't even really like roller coasters, so I don't know why I went on it in the first place!

2. Of a basketball player, to officially state that they will participate in the NBA draft after one year of playing college basketball. If he ends up being one and done, which NBA team do you think is most likely to take him? A: "Did you hear? Jones is one and done." B: "Yep, to the disappointment of Villanova fans everywhere." My mother was adamant that I get a college degree, so she never would have let me be one and done.