The difference between Butt cheek and Nether cheek
When used as nouns, butt cheek means a buttock, whereas nether cheek means a buttock.
check bellow for the other definitions of Butt cheek and Nether cheek
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Butt cheek as a noun (North America, slang):
A buttock.
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Nether cheek as a noun (often, pluralized, euphemistic, sometimes, humorous):
A buttock.