undertail

Term used in place of Undertale when the content in question is NSFW.
Toby Fox, the developer of Undertale, invented the term in order to make it easy to distinguish between SFW and NSFW Undertale content.
Most frequently used as a tag for Rule 34 of Undertale.

/r/Undertail is a subreddit for Rule 34 of Undertale.

by Smerg the Dargon June 19, 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

by Rainy Melai October 26, 2017

undertale fangames

the thing that has like 36432645738265782343924638256873265 gaster blasters and bunch of shit that is like impossible to dodge

human being 1: i like undertale fangames
human being 2: *pulls out a fucking shotgun*

by the unfunny kivi guy October 11, 2023

Chara (Undertale)

A misunderstood 5 year old who is depicted to be a murder, but really our actions define them. They don't want to kill people, but we influence them.

Chara (Undertale)?
Are you there?
...
Why would you kill everybody?
*But I didn't!*
I don't believe you.
*The player did!*
*Please, listen to me!*

by UndertaleForLife! May 9, 2018

Story of Undertale

Undertale parody of "Bad Romance"

it goes like this:

Whoa-oh-oh-oh-oh-oh-oh-oh-oh-oh
Story of Undertale
I fell from the light
Talk? Or should I fight?
Monster genocide
This my Undertale
I fell through a cave on Mount Ebott
I faced an evil talking flower in a pot
Explains the plot
Wants me dead, wants me to rot
Toriel saves me, takes me to her home
And hooks me up with a brand-new monster phone
Leaves me alone
But I escape and meet some bones
Should I be a pacifist?
Or should I use my fists?
I'm feeling evil, think I'll kill them all
I'm homicidal and I've got a taste
I want to wipe out the monster race
I've got no patience, I've got no resolve
I will slaughter, screw the dialogue
I fell from the light
Talk? Or should I fight?
Monster genocide
This my Undertale
I'll slaughter Undyne, I'll waste who I choose
With all this EXP there's no way that I'll lose
Now watch me move
I won't stop, I'm feelin' rude
Asgore is shaking, he hears my approach
I'll slaughter Sans and squash his bro like a roach
Chara's my coach
All these monsters I will poach
Screw being pacifist
I think I'll use my fists
I'm feeling evil, think I'll kill them all
I'm homicidal and I've got a taste
I want to wipe out the monster race
I've got no patience, I've got no resolve
I will slaughter, screw the dialogue
Whoa-oh-oh-oh-oh-oh-oh-oh-oh-oh
I'm in a different trail
Whoa-oh-oh-oh-oh-oh-oh-oh-oh-oh
it has more but I can't type it

by Ebeneezy November 11, 2022

undertale

Meme game made by indie developer Toby Fox. Undertale became such a big hit that Toby's now swimming in cash and laughing at the retards who spent millions in making a game that sold less than his.

You should play Undertale

by KajurN February 2, 2016

Underfag

Any Undertale Player/Fanboy that meets the following Criteria.

1) Is obsessed and will go to any length to get the merchandise .
2) Is under the age of 10.

Guy A: God Damnit
Guy B: What?
Guy A: My little brother is such an Underfag

by ExtraShard July 4, 2016