undertaled 

When you look up something mundane, but Undertale-related results come up.

I did a Google Search for spaghetti and got pictures of a skeleton with a scarf
Looks like I've been Undertaled

undertaled by just another random rando July 2, 2017

Undertaled 

When somebody or something does something relating to the 2015 game Undertale.

Me:Oh man, she just straight up Undertaled you!

Undertaled by IceG15464 May 23, 2018

underpayed & overworked

Not getting enough money for the amount of work being done.

Getting underpayed & overworked @ any job really sucks.

underpayed & overworked by jpg3 September 29, 2013

underrated comment 

The response to every top YouTube comment.

*clever comment with thousands of upvotes*
“underrated comment”

underrated comment by pqalmz November 1, 2020

The Undertaker 

When you throw your partner off Hell in a Cell, and they plummet 16 feet through an announcer's table.

"I gave my GF a sexy The Undertaker last night."
"Is she okay?"

The Undertaker by ahmahm June 23, 2017

undertale 

Undertale is a game created by indie developer, Toby Fox. In it, you can choose to either spare every entity that appears before you, or slaughter them mercilessly. It has multiple endings, a fantastic soundtrack, and although it doesn't have the best graphics, its story, wittiness, and humor make it a very enjoyable game.

Undertale gave me big feels.

undertale by killermoobs October 14, 2016

sans undertale 

a super smash bros ultimate dlc character.

im totally maining sans undertale tbh

sans undertale by Bidoof Is A Pokemon November 3, 2018