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When the asscrack starts at the lower back.
look over there is that his ass crack? No his pants are up it's his back crack
by logan December 21, 2003
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2
When a fat persons back is squeezsd together to resemble a butt crack.
1. Bill Clinton likes when he gets a glimps of pure unadulterated Back crack.

2. Most people hate it when a bead of back crack sweat slide into their butt crack.
by John Mousie February 17, 2009
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3
A butt crack that extends above the waistline sometimes even to the middle of the shoulder blades.
Man JD has a bad case of backcrack!
by superknox1andonly December 22, 2014
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4
When a person is so fat that their butt crack extends up the middle of their back.
In my yoga class today, the new guy showed a serious case of back crack during several of the poses
by 3episodesofLITB July 24, 2018
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