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1) A gesture to indicate that there is no harm done.
2) A gesture to indicate lack of effort.
1)-Hey man, thanks for carrying that piano for me!
-Ain't-a-thang
2)-Hey man, sorry for Denting your car
-Ain't-a-thang
3)-My bad!
-Ain't-a-thang
by Chingyiswack January 04, 2006
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