UnderLust 

An alternate universe of the game UnderTale containing almost everyone as lust filled monsters, and Mettaton EX as a shy talk show host.

UnderLust was created by nsfwshamecave on Tumblr.com

UnderLust by DepressingVoice16 June 28, 2016

Underlust 

Underlust is Au, of undertale where soul falls into the underground but its not the monster's think. So they send it to W.D Gaster to research about the soul and Gaster finds out that, He can eject the lust in monster's, And then every monster in the underground is filled with lust, Including, Toriel, Sans, Papyrus, Undyne, Alphys, Mettaton/Happstablook and Asgore, And then Asriel is in this world, Toriel and Asgore Where happy about there child and then, Asriel dies and turns in to dust, Toriel and Asgore in Sadness, The ashes of Asriel go on a flower bed and the flowers (Which where roses) made Rose and then Happstablook and Alphys meet up in a Human-Fan-Club and Sence Happstablook likes being on stage Alphys decided to build, Happstablook a Robot body (That was a Sexual related body cause of course not) And Mettaton is on stage and got tons of fans, One night though everything changed, After a show Mettaton was Sexually Assaulted and Beaten by one of his "Fans" Sence Mettaton Was badly beaten Alphys Was trying to repair Mettaton, By doing Minor repairs, and giving him glasses. And is a tad-bit shy now. And a Teen falls into the Underground to soon realize that there is sexual reference's Every where. And that where we are now.
Weapons: Toriel/Old police Batons, Sans/A ripoff of Asriel's Swords, Papyrus/Fists, Undyne/Whip, The rest of these are fists.
I'll leave the rest of the detail's to you.

Guy 1:Man, underlust makes me look like a Virgin.
Guy 2: I like underlust, although it has a sour taste its actually pretty good.

Underlust by Etp445 (Unoffical) September 17, 2020

Underlust 

You're better off not knowing.

Person 1: "Hey, what's an Underlust?"
Person 2: "Do you know what Men in Black is?"
Person 1: "No, what does that have to-"
Person 2: *puts on shades* "I can explain everything, but first, I'll need you to look into this tiny light."

Underlust by Aqxer June 14, 2021

Underlust 

A undertale porn verson. These Things usually destroys the undertale community.

What is underlust? A undertale porn verson. These Things usually destroys the undertale community.

Underlust by ZenTheCreator November 28, 2016

You underestimate my power

The act of declaring that one is good at something right before fucking it up.

Derives from Star Wars Episode III: Revenge of the Sith where Anakin Skywalker says this to his former master Obi-Wan Kenobi right before lunging at him and getting his left arm and both of his legs cut of by a lightsaber.

Obi-Wan: "It's over Anakin, I have the high ground"
Anakin: You underestimate my power!"
Also Anakin: (Lunges at him and gets fucked by his laser sword and then caught on fire)

You underestimate my power by buttonmasher525 January 2, 2018

understandable have a nice day

It is understandable, so you may have a nice day; even if you didn't get your ice cream from McDonalds.

"Hey you got some food?"

"Sorry food broke"

"Understandable have a nice day"

understandable have a nice day by That gouy May 22, 2017

I understand that, but 

Used in exasperation during an argument, with a notable impatience intended to slightly patronize the other party while furthering the speaker's other reasons.

Look, I didn't mean to shoot Marvin in the face.

I understand that, but that doesn't change the fact he's dead.

I understand that, but by Nobody0000 January 20, 2011