up the yin-yang

• out the ying yang
• up the yin yang
• up the ying yang
• up the ying-yang

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up the yin-yang

1. (idiomatic, colloquial, mildly vulgar) excessive(ly); much more than necessary.

   We've got bananas up the yin-yang this week. Does anyone know how to make banana bread?

   • 1977, Educational Theatre Journal‎, volume 29, number 2, University and College Theatre Association.; American Theatre Association, page 280:

     ...the currently fashionable barbarism of plus used as a conjunction; and the reference to Ethel Merman as "The Merm"; and the misuse of a favorite slang expression ("... these Kander and Ebb songs did their duty up the yin-yang (sic)").

• up the wazoo