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The line under the butt cheek, useful in measuring how nice the butt is considered, where the butt meets the thigh. The size of the line depends on the butt to thigh ratio.
Guy 1: Yo dude check that girl's booty out.
Guy 2: Wow, her booty crease makes it so much sexier.
de Hugh G. Wreckshin 3 février 2011