Jellybutton 

Another term for a woman's clitoris.

Look at the size of that woman's jellybutton...must be a tranny!

Jellybutton by Dry Toast May 2, 2012

jellybutt 

A butt that shakes like jelly

That old ass moves like a jellybutt

jellybutt by Bouncinballs May 19, 2010

Mr. Bellybutton 

Mr, Bellybutton is someone that you will hate or be friends with. Mr. Bellybutton is overweight and walks around with his bellybutton hanging out.

Did you see Mr. Bellybutton's stomach?!?! IT WAS HUGE!!!

Mr. Bellybutton by ⒾⓐⓜⓈⓄⓊⓅ December 3, 2018

Bellybutton bargain

A bellybutton bargain is someone who is rather large/heavy/fat/overweight/or pleasantly plump.
It can also mean that someone has an obsession for bellybuttons

Person1:Jude man look, it’s a bargain.

Person2: holy shit man you’re right, that is a fucking bellybutton Bargain.

Bellybutton bargain by Press watches March 4, 2023

bellybutton gook 

the dirt, debris, and dead skin cells that collect in the pool of an innie bellybutton.

bellybutton gook is yummy

bellybutton gook by sweet-ass April 29, 2006

bellybuttoning 

It's when I stick my finger in your bellybutton!

Yelling "bellybuttoning" while I put my finger in your belly button.

bellybuttoning by YOLO212121 February 2, 2014

bellybutton glow in the dark 

A Zarry Stylik tweet

you make my bellybutton glow in the dark

bellybutton glow in the dark by Harry's Canyon Moon February 28, 2021