Exposed skin on the "down under" side of the breast such as under an extremely short crop top.
The cheerleaders had super hot outfits that flashed Australian cleavage whenever they shook their pompoms over their heads.
by mandingoh May 26, 2006
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Exposed skin on the "down under" side of the breast such as under an extremely short crop top.

The article was in the issue with Scarlett Johansson's Australian cleavage on the cover.
by Swinglow May 29, 2006
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Accidentally exposing your tramp stamp/ass crack at an inopportune time.
Rob: "Did you see Mrs. Johnson today? She totally showed us some Australian Cleavage Backstyle when she bent down to pick up those papers."

Edward: "Yeah, it was totally hot. Who knew she had a tramp stamp?"
by Lilyperks November 29, 2012
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