What is builders crack?

Australian origin. Refers to the "bum cleavage" displayed most commonly by builders on construction sites, as their shorts or pants "slip". Pants worn by males at the mid-buttock level.
See Builder's Bum etc.

A: Check out that Builders Crack.
H: Nothing better than a bit of builders crack coming out of a noice pair of terry towelling shorts.

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builders crack - video