humdinger

1. (informal) Something that is particularly outstanding, unusual, or exceptional.Examples: "Most of the questions were pretty easy, but that last one was a humdinger."; "“—immense. I'm a real, slam-bang, honest-to-goodness, three-fisted humdinger. I'm a bona fide supraman.” “Superman?” Clevinger cried. “Superman?” “Supraman,” Yossarian corrected."; "“I’ve seen some humdingers, but never any ordinance like this,” said Mark Hayes, general counsel for the Arkansas Municipal League, an organization for towns and cities."informal