A skeleton based character from the indie video game Undertale, developed by Toby Fox, that is apparently a meme.
by Kioki Isumie July 12, 2019

doug: oh man i sure do love sans undertale
josh: me too doug
doug:im glad we share interests josh
josh: yes were very good friends
josh: me too doug
doug:im glad we share interests josh
josh: yes were very good friends
by Sand Undertlae December 7, 2020

Friend 1: Hey, you wanna come over and play some Undertale?
Friend 2: Nope, im getting double xp on Call of Duty. Undertale is shit.
Friend 1:, Fuck you, youre just one of almost no one undertale haters.
Friend 2: Nope, im getting double xp on Call of Duty. Undertale is shit.
Friend 1:, Fuck you, youre just one of almost no one undertale haters.
by AsrielDreemurr#1 February 5, 2017

1 i like story of undertale - *gets shot in the head
2 bob: dude stop being a story of undertale and get over here
2 bob: dude stop being a story of undertale and get over here
by PikaboyMOD February 4, 2022

by SarcasticSackO'Crap May 29, 2019

By listening to undertale ost's your vrt increases by 100% causing you to get good kovaak's scores. Often people confuse it with 𝓪𝓲𝓶𝓫𝓸𝓽*.
*𝓪𝓲𝓶𝓫𝓸𝓽- a bot that aims.
*𝓪𝓲𝓶𝓫𝓸𝓽- a bot that aims.
Me: oh you got a good score on arc dodge switch?
My friend: yeah i used the undertale effect.
Me: oh that makes sense now
My friend: yeah i used the undertale effect.
Me: oh that makes sense now
by Saltcult February 9, 2021

Playing undertale is a term used for a form of homosexual intercourse, in which the dominant male forces their hand fully into the "underground", another term for the other mans asshole.
by ReimuSEES February 14, 2021
