underappreciator 

one who does not give true value to a certain item of extreme value

Jasen did not give give my trade in it's proper value and blamed it on John, he is such an underappreciator!!!!

underappreciator by undervaluer July 16, 2013

Sands Underman 

The act of commiting yes over and over again.

Guys, Sands underman is commiting yes with my mom :(
Guys, Sands underman is right under my bed RN H E L P

guys sands underman is so pro 😱

Sands Underman by Sands underpro November 30, 2021

Undermans up 

Being full; usually used after a meal or large snack

Izaak: man that was a good meal
Dagen: undermans up
Izaak: most definitely

Undermans up by Bonkzzz April 6, 2022

underlap 

(proposed definition)

Two areas underlap when there is a gap between them - rather than just touching.

When hanging wallpaper, you should arrange the sheets so that they neither overlap nor underlap.

underlap by Ed Avis June 21, 2003

Underappreciated 

Someone who never gets respect for how good they actually are at something.

Man, Adieny Hechavarría is so underappreciated. Why is he not a Gold Glove winner?

Underappreciated by The Beast (The Real One) September 16, 2020

undermanding 

related to manderstanding ; used to imply that an understanding is solidified or furthered by the bonds of manhood.

I know it was lame to ditch to party to watch Sex and the City, but I needed some 'me' time. I knew I could trust you not to tell anybody; I'd never hear the end of it! Thanks for undermanding, bro.

undermanding by rocketsfriendsara June 16, 2010

Underman 

Underman, or undermensch, is the opposite of Nietzsche's 'Uberman', or overman. Underman is what man will devolve into, and will assume a state close to that of a feces-flinging chimp.

John: Did you see the Henderson kid? He can't do anything but drool and suck applesauce.

Jack: This is what happens when paternal twins marry: they produce the underman.

Underman by Vader1941 June 21, 2010