up the yin-yang

[Benjamin Barrett]

I was surprised to see "up the yin-yang" not in the OED or the AHD.

The earliest cite I see on Google Books is 1976.

"Better foot forward: the history of American musical theatre," by Ethan Mordden, page 333, http://ow.ly/6Ey8t

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And Chicagol For all their fidelity to outdated pop, these Kander-Ebb songs did their dramatic duty up the yin-yang.
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I think this is a well established expression, though probably best considered informal or slang.

Benjamin Barrett
Seattle, WA
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