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a shorter way of saying "that a girl!"

it's basically saying to someone "way to go!"
*maddie's team is tied with 5 seconds on the board, she shoots, and makes it in the last second of the game. her coach some over to congratulate her and says " ayyee, atta girl!" and pats her on the back.*
by flocka4pres May 27, 2015
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Kiwi/New Zealand slang for sure, whatever
"See that chick there cuz? rooted her lastnight"
"Atta not even boy!"
by The_Jackal August 16, 2006
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