A belly button that is neither an innie nor an outie. Innies are completely inward, and outies go past your abdominals (and are completely sick). An innie-outie is the most common of all belly buttons, and most people with this certain attribute are filled with contempt over their unattractive belly button. Like me. They also cannot get their navels pierced because it just wouldn't look good.
" Man, what the hell? I've got an innie-outie belly button, so I can't get a fucking belly button ring! Shitskies!"
"Yeah, Sha is super jealous of those Dantity cane girls and their hooker belly button rings. Bitch can't get one because of her innie-outie."