Wiktionary
butt cheeks
n. (butt cheek English)
Usage examples of "butt cheeks".
Those who couldn't are the sort who couldn't find their own butt cheeks with both hands anyway.
When he came close enough, she lunged, right between his legs, so hard that if her wooden sword had had a point it would have come out between his butt cheeks.
Putting his hands under her butt cheeks, he raised her slightly and used his knees to spread her thighs.