Noun
(slang) A navel that is formed of a hollow in the abdomen (as opposed to one that protrudes from the abdomen).
(slang) A vagina with inner labia minora.
(childish or euphemistic) A vagina seen as an inverted version of a penis.
An introvert.
Source: en.wiktionary.orgNow “Innie and co.” consists of Innie, Vicky, Maggie, and Finn. Source: Internet