Top Definition
A congratulation for doing something beasty or awesome.
"dude! I just banged Megan fox!"
"atta baby!"
by One eyed midget February 23, 2011
A term used to congratulate another or show approval for an act or accomplishment. Similar to the term attaboy.
So I saw that you left with miss new booty last night, huh. Attababy!
by B. Floyd August 23, 2008

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