n. someone or something excellent. (Caution with hummer. See also hum job.) : Now, this one is a real humdinger. , Man, that's a hummer!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
humdinger
1905, Amer.Eng., originally used of beautiful women; probably from dinger, early 19c. slang word for anything superlative.