Undertail

the DeviantArt tag that is used to separate NSFW and SFW art from the game/fandom UNDERTALE. The first one of these images was uploaded 4 days after undertale as a game released. I love this shitstain of a fandom I'm in

guy one: yo have you seen what the fandom has done to undertale?
guy two: yea, there's a whole other part called undertail, the art is actually pretty good.
guy one: have you...
guy two:
guy one:

by not william afton December 5, 2020

undertaker01

A person that likes to mine a lot and grind and is also insane.

They are also really good at editing

Undertaker01 is a clout chaser

Undertaker01 is a your bet just to expose for clout

Undertaker01 is insane

by Octowisp April 29, 2021

Underage Adult

A child who is mentally, physically or emotionally mature. Or a grown-up, legally of age who is not physically, emotionally or mentally mature.

I was an underage adult when I asked a 40 year old man for a kiss.

by Netta Y January 10, 2022

Underdandable

A stupider way of "understandable".

"I just watched a bird fly into a window"
"underdandable"

by a cookie cooler than cheese March 26, 2022

pure underhand

1. A term in badminton, regarding an excellent underhanded return

2. Just think about it. No formal definition, but considered an inferior form of bushikan

"and that, my friends, was the night i gave her the pure underhand"

by Vance, of the Trifecta April 25, 2004

sick underpants

comfortable underwear worn when one is sick that offers fuller coverage than a thong, bikini or other daytime underwear. Also the essential underpants for a hospital stay.

When I had the flu I wore my sick underpants and my flannel pajamas for a week.

by Heymercury April 20, 2010

Undertale-Undertail

This is a difference

Undertale-Undertail

by When_ January 19, 2021