noun (plural innies)informal
A concave navel: belly buttons can generally be divided into innies and outies
More example sentences
- Whether you sport an "innie" or "outtie" is determined at infancy.
- So now it looks like Cal has a nice little innie.
- It's just that my belly button was born as an innie and has no business becoming an outie, at least not without my express permission.
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