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