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.

by Sidney Lambert November 05, 2006

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