American Heritage Dictionary
(1)
Century Dictionary
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
Ranging from the turn of the century (Clara Bow and the footballers) to last week (Does Suri exist?), each story is a humdinger, and despite being disproven in most cases, they've managed to linger around much longer than their subjects would have liked.— Entertainment Weekly's PopWatch
Once in a while, a random comment can serve as a humdinger of a reality check.
However, Milan regained their composure as a humdinger of a long-range effort by Andrea Pirlo levelled the scores and then a rare misjudgement by Iker Casillas saw Pato give the Italians the lead.— JamaicaObserver.com | Lead Stories
Are you that terrific I'm a humdinger, Bub.— The Short Life

American Heritage Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a year.
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