undernuts 

The area directly below the scrotum.

I don't know why my undernuts is so itchy.

undernuts by Dreadlocke May 22, 2006

Undernauseated 

The state of being far below the mental breaking point how many stomach cringes a consciousness can endure before all weakness, disguised as pain has completely evacuated that body.

The undernauseated talent enjoyed victory.

Undernauseated by Ranchgirls November 28, 2020

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

Underbus

Verb used to describe the act of "throwing someone under the bus" or otherwise admitting someone's wrongdoing for them.

My sister was in trouble with my mom, so she underbussed me for something I did last week, and got herself off the hook.
An underbusser is a grown tattletale.

Underbus by misshappenstanc October 9, 2017

Undercut 

A strategic move in racing to get past the car in front without actually overtaking it on track. The car behind will pit earlier, do a quick lap on fresh tyres and come out in front once the other car has pitted.

Commentator: 'Red Bull are pitting this lap, they might be trying to get the undercut on the Mercedes.'

Undercut by James Vowles May 13, 2021

Undercutter 

Someone who tries to steal your business by offering the same service/product for less money.

Javi Rox: Yo, I got these cheeseburgers! I sell them to you for a dollar!
Jay Nyce: I got those same cheesburgers for 50 cent!
Javi Rox: I hate that motherfuckin undercutter.

Undercutter by Domexicano March 17, 2005

Undernose 

The act of placing a COVID mask under one's nose to facilitate easier breathing by completely defeating the purpose of wearing it at all.

Example: "I told this lady at work to put a mask on but she undernosed it so I walked away."

Undernose by Milk Lunch June 23, 2020