navelingus
Oral copulation with someone's navel. Using your tongue to lick and penetrate your partner's belly button. The practice can be performed on women or men. There's nothing gay about it.. yet.
While doing body shots. Bob chased the tequila into Jennie's belly button; giving her some navelingus with a few quick tongue pokes to her innie. When she giggled and smiled, he knew he was in for a good time.