Commonly used vulgar slang for the vulva, or external female genitalia. Mainly consists of the labia, the clitoris, and the openings of urethra and vagina. The latter is a passage that leads to the cervix and ultimately the uterus.
Examples
Anatomy of vulva.
An "outie pussy" with the clitoral hood and labia minora exposed between the labia majora.
An "innie pussy" with the labia minora not protruding into the cleft of venus.
