The difference between Bum crack and Butt crack
When used as nouns, bum crack means the space between the buttocks, whereas butt crack means the gluteal cleft.
check bellow for the other definitions of Bum crack and Butt crack
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Bum crack as a noun (slang):
The space between the buttocks.
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Butt crack as a noun (US, vulgar, slang):
The gluteal cleft.