attaboy

[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

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World English Dictionary
attaboy (ˈætəˌbɔɪ)
 
sentence substitute
slang chiefly (US) an expression of approval or exhortation

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

attaboy
1909, from common pronunciation of "that's the boy!" a cheer of encouragement or approval.
Online Etymology Dictionary, © 2010 Douglas Harper
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