The meat or fat of the arm, located at the triceps that dangles, or hangs down when someone raises their arms up.
As Christy went to write of the chalkboard, she showed off her chicken wing to the rest of the class
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The fat, either in front or behind on the shoulder that flows over the top of a shirt, dress, etc.. Most commonly see on women trying to wear skin tight clothing.
Ashley was wearing a fancy dress in class, but everyone could see her shoulder flab.