RhymeZone: yin-yang definitions

Definitions of yin-yang:

noun: Yin and yang.
noun: A circular symbol with white and black sections (☯), representing the fusion of the concepts of yin and yang.
noun: (colloquial, somewhat vulgar) The vulva or vagina.
noun: (colloquial, somewhat vulgar) The anus or rectum.

(Definitions from Wiktionary)