半ケツ
Also called "plumber's crack", it is the top-most region of the [[ass]] that is usually seen if the character's [[pants]] are too loose fitting. Alternatively if a character's ass is too large for their bottom clothing, then the top most region of their ass may be visible. If the full [[ass]] is visible, then just use [[ass]] as the butt crack tag is only to refer to a partially visible portion.

h4. Examples

* !post #8049997
* !post #7857541
* !post #6332288
* !post #434148

h4. See also

* [[Downpants]]
* [[Lowleg]]
* [[Wedgie]]
* [[Y shaped butt crack]]
* [[Whale tail (clothing)|]]

h4. External links

* "Wikipedia: Intergluteal cleft":https://en.wikipedia.org/wiki/Intergluteal_cleft
* "Wikipedia: Buttock cleavage":https://en.wikipedia.org/wiki/Buttock_cleavage
butt crack