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The definition of an atta girl is a compliment or words of encouragement given to a girl who has done a good job on something.
An example of an attagirl is when your boss tells everyone at the meeting that you did a great job on your last project.
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
indicating approval or encouragement: said to a woman or girl
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Informal Used to show encouragement or approval to a girl or woman: Attagirl! That was a great shot!
Origin: Alteration of That's the girl!.