underffed 

A unique way to pronounce underfed if you were illiterate.

If 100 people lived on earth then 15 people would be underffed

underffed by Yeldarb Knarf February 23, 2018

underfletched 

A VERY cool person who plays video games

Hey Jack! Wanna Play Some Fortnite?
Sure! Lets Invite UnderFletched

underfletched by wag1pffting April 27, 2019

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

Underfed 

When an organism isn't given enough derf to sustain itself; past tense

John: I forgot to feed to my dog and it was taken away because it was "underfed", what does that mean?
Sal: You didn't give it enough derf idiot, take better care of your pets.

Underfed by Capitaliism February 5, 2021

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

Underaged boy 

Did u really just search underaged boys you better get off the internet the cops are on the way u sick pedo fuck

Jared: U want to pick up some underaged boys

John:no I’m calling the cops

Underaged boy by U are sick September 26, 2019

underaged townie 

townie who has not yet arrived at puberty, but still believes they can start on people.

(high pitched voice)
"Mate will yu buy us some fags?"
"no"
"fucking wanker"
"Ha"

underaged townie by bob April 6, 2005