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attaboy

 - 3 dictionary results

at⋅ta⋅boy

[at-uh-boi]
–interjection Informal.
(used as an enthusiastic expression of encouragement or approval to a boy, man, or male animal.)

Origin:
1905–10, Americanism; alleged to be a reduced form of that's a boy or that's the boy
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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at·ta·boy   (āt'ə-boi')   
interj.  Informal Used to show encouragement or approval to a boy or man: Attaboy! That's the way to hit a home run!

[Alteration of That's the boy!.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

attaboy 
1909, from common pronunciation of "that's the boy!" a cheer of encouragement or approval.
Online Etymology Dictionary, © 2001 Douglas Harper
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