When some one, usually a young guy, has a visible six pack solely due to the lack of any body fat at all. Not buff, just skinny.
Girl: Ohh my god, he has such a good body!
Other Girl: Shut up, those are skin abs, he's really just a twiglit.
Other Girl: Shut up, those are skin abs, he's really just a twiglit.
by Gmonayy November 18, 2011
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Skin Abs • skin • skin flute • skin dog • skin-flint • skin tags • skin job • skin byrd • skin the cat • skin-to-skin