- 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.
attagirl definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Informal indicating approval or encouragement: said to a woman or girl
also sp. atta girl
attagirl definition by American Heritage Dictionary
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!.