Etymology
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hummer (n.)

c. 1600, of insects, agent noun from hum (v.). Meaning "energetic person or thing" is 1680s; that of "excellent person or thing" is slang from 1907. As short for Humvee, attested from 1983.

updated on September 11, 2015

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Definitions of hummer from WordNet

hummer (n.)
a singer who produces a tune without opening the lips or forming words;
hummer (n.)
(baseball) a pitch thrown with maximum velocity;
Synonyms: fastball / heater / smoke / bullet
From wordnet.princeton.edu, not affiliated with etymonline.