bellybutthole 

When one puts a large amount of fecal matter into another's belly button and squeezes it out without using their hands.

Bob realized that he had not taken a shower since the night before, and had not finished using his bellybutthole all over Susan's chest.

bellybutthole by Palpaca June 16, 2016

Bellybutthole 

It's when mostly people who have just saggy bellybuttons or have/had a bellybutton piercing and they take it out and their belly bellybutton looks shriveled up and literally is like a butthole on your belly.

Friend 1: "look over there at that girl in the crop top"
Friend 2: *looks twards girl*
Friend 1: "yo shes got a bellybutthole!!"
Friend 2: " yoooo her bellybutton does look like a butthole!"

Bellybutthole by 4Fletcher November 25, 2018

belly butthole 

A belly butthole is like a belly button only it goes deeper so that when you stick your finger in there and pull it back out it smells funny.

He has a navel so deep and smelly, it's more like a belly butthole than a belly button.

belly butthole by mcdisease August 19, 2015

Belly Butthole 

an in-betweenie belly button; the mixture of an outie (belly button) and an innie (belly hole); belly button + belly hole = belly butthole.

Person 1: “Do you have a belly button, belly hole, or a belly butthole?” Person 2: “Well, I have an in-betweenie... so, a belly butthole!”

Belly Butthole by BellyEnthusiast69420 June 20, 2020