a person or thing that booms.
a person who settles in areas or towns that are booming.
Informal. baby boomer.
Informal. a wandering or migratory worker; hobo.
a period of sudden and decisive economic growth: July was a boomer for the retail trade.
Informal. a person, fad, etc., that enjoys a brief popularity or financial success: A new group of boomers made this season's hit record.
an enthusiastic supporter; booster: The boomers tell us our town can double its size.
Australian. a fully grown male kangaroo, especially a large one.

1820–30; boom1 + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
boomer (ˈbuːmə)
1.  (Austral) a large male kangaroo
2.  informal (Austral), (NZ) anything exceptionally large
[from English dialect]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

mid-15c., earliest use was for bees and wasps, probably echoic of humming. The meaning "make a loud noise" is 15c. Cf. bomb. Boom box first attested 1978.

"long pole," 1540s, from Scottish boun, borrowed from Du. boom "tree, pole, beam," from a M.Du. word analogous to O.E. beam (see beam). The business sense (1873) is sometimes said to be from this word, from the nautical meaning "a long spar run out to extend the foot of a
sail;" a ship "booming" being one in full sail. But it could just as well be from boom (v.), on the notion of "suddenness."
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

boomer definition

  1. n.
    a laborer who moves from one economic boom to another. : Fred's great uncle was a boomer in the days of the Oklahoma oil rush.

  2. Go to (baby) boomer. :
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences for boomers
Membership is expected to grow significantly as baby boomers age.
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