When the anus is tightly pulled together and pushed up/out in a way that exposes distinct wrinkles, folds or "puckers". The main distinction of this tag versus the normal anus is the greater attention to detail.
It is also informally known as a "doughnut" anus.
Examples
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Incorrect Examples
no distinct pucker wrinkles/folds/lines
don't use on posts that are clearly just the stylized/unrealistic x anus
