Underdoes 

The opposite of a overdoes, when you don’t have enough medication to stop all your mental illnesses from showing so you seem off to everyone else because your more sad or hyper.

Guy 1: yo why are you so hyper today?

Guy 2: I didn’t take my medication thats why

Guy 1: Oh so your having a underdoes

Underdoes by CheezyLily March 28, 2022

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

Underoos 

A nickname or name for undergarments that are tight, similar to that of spandex. Also used as a nickname from Tony Stark to Peter Parker in Captain America Civil War.

Tony Stark: "Alright, I've run out of patience, UNDEROOS!" Peter Parker (Spider-Man) flips in.

Underoos by Peterparkerfanfic October 1, 2017

Underboss 

Member of a mafia family, typically directly underneath the Don. Handles the mundane details of running a crime family.

The underboss put the capo in charge of making sure the hit was carried out.

Underboss by Roberto Manchez December 29, 2004

a horrible pixelated shot of an underdeveloped highschool freshman in their underwear trying their best to make a seductive face 

The default picture used by over 84% of users of the popular networking site myspace (See definition #4).

-Man, she looks fine!
-Can't you tell? That's a horrible pixelated shot of an underdeveloped highschool freshman in their underwear trying their best to make a seductive face, dude.

a horrible pixelated shot of an underdeveloped highschool freshman in their underwear trying their best to make a seductive face by cchriss92 August 9, 2007

Underestimate 

1. Rate something lower than its real/actual value , under appreciate.
2.Estimate/ rate someone lower than his/her actual potential, qualifications.

You underestimated that problem because you are not familiar with it.
Don't underestimate 'em simply because they are young.

Julian: Ask your lil bro to quit that chalenge it is very hard for him.
John: Don't underestimate my little brother his able.

Underestimate by julianmosha January 2, 2017

underdecking 

conspiring against an authority figure to take synchronized shits underneath said authority figure's deck. Usually performed in groups of two to five people. In extreme cases, shit burritos are fashioned with paper towels and left to be found.

Oh, no. Have you seen the kids? I hope their not underdecking us again!

underdecking by underdecked July 2, 2009