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underbutt
When the bottom edge of the butt cheeks is visible beneath the clothes.
Underbutt is the equivalent of underboob for butts. It can happen when a character wears a short skirt, dress or short shorts/micro shorts that shows only the lower portion of their ass cheeks. The exposed area may still be covered in pantyhose or the like.
Examples
The following tags are aliased to this tag: gluteal_fold_peek (learn more).