innie

1. Anything concave; especially:

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

2. (informal, slang)A vulva with inner labia minora.

3. (childish, euphemistic, informal)A vulva seen as an inverted version of a penis.

4. An introvert.

regular