Gluteal cleft
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The gluteal cleft is the groove or crack between the buttocks that runs from just below the sacrum to the perineum, so named because it forms the visible border between the external rounded protrusions of the gluteus maximus muscle. The gluteal cleft is the location of the anus.
Slang terms
Slang terms for the gluteal cleft include buttcrack, asscrack, carpenter's crack, coin slot, the plumber's cleavage, plumber's butt, or builder's cleavage.
See also
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