Definition of "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.

1961, Joseph Heller, Catch-22, London: Vintage Books, published 2010, page 22

“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.

2011 July 19, Robbie Brown, “Arkansas Town Draws a Line on Clubs”, in New York Times‎