undernelly 

Used to describe the feminine or "girlie" side of a masculine or straight-acting gay man which is typically hidden (often requiring great effort) but that will occasionally be revealed in an unguarded moment. Exposing this feminine side, even momentarily, results in diminished masculinity and weakness.

Dennis: "I used to think Tom was the roughest, toughest bear I had ever met, until he squealed like a 5 year old girl when he saw that mouse!"

Peter: "Yeah dude, he showed us some serious undernelly a minute ago."

Dennis: "After seeing his undernelly I'll never look at him the same way again."

undernelly by PJMillar September 9, 2009

underfell 

UnderFell is an Alternate Universe created by fans. The main idea of it is everyone is their cruel counterparts, and apparently only wear orange, black, and red.

UnderFell is my favourite AU!

underfell by DepressingVoice16 July 6, 2016

Underfell Papyrus 

The Edgy Angry Alternate Universe Counterpart To Papyrus. He's more popular than that cool skeleton and has all the girls, such as Akari.

Akari stopped as Underfell Papyrus loomed over her, an angry expression on his face as usual

Underfell Papyrus by Rainy Melai October 26, 2017

Soft White Underbelly 

The bus terminal at Union Station in Denver, Colorado.

He took the 15 to Soft White Underbelly to pick up some clr and blues.

Soft White Underbelly by spigotthebear February 17, 2023

Underbell 

The underside of one's penis, usually towards the end.

Ouch my underbell!

Underbell by Tomujs August 7, 2012

underbelly cleavage 

(noun): A rather large portion of fat extruding from a person's (man or woman) shirt, so much the belly is sticking out of the shirt he/she is wearing. The inverse of cleavage.

Eww she is showing some serious underbelly cleavage. Turn away!

underbelly cleavage by UNknownINformant May 22, 2009

Underell 

1. A pre-meditated cancellation of plans, in an attempt to appear busier than one actually is

"Yeah, we're not going anymore... he said some ex is in town but if you ask me we just got Underelled"

Underell by DR April 4, 2005