Definition of "innie"

(informal) Anything concave; especially:

1. (slang) A navel that is formed of a hollow in the abdomen (as opposed to one that protrudes from the abdomen).

2. (slang) A vagina with inner labia minora.

3. (childish or euphemistic) A vagina seen as an inverted version of a penis.  examples

An introvert.  examples