Underkaine 

A combination of the two brothers of destruction Kaine and the Undertaker

Underkaine took down Vince McMahon

Underkaine by Nick Huddleston October 18, 2008

underknee 

The area on the back side of the leg, directly behind the knee, above the calf and below the thigh. Similar to the under arm, but less hairy.

Underknee was chosen as a better name than kneepit for the area on the back of the leg, directly behind the knee.

underknee by NewHavenFunnyGuy October 20, 2009

Undermine 

to lower the standards

"...we are not going to undermine our community by creating or promoting alternative services..."

Undermine by JacobMS December 13, 2012

Underminer 

A person that will intentionally sabotage someone else through any means necessary.

He stole from me after I tried to help him, so I undermined him by making sure every business in the area knows that he is a shoplifter.

I am an underminer.

Underminer by Thingsda October 21, 2019

Undertaining 

Not entertaining. Boring. Not interesting. mind-numbing, tiresome, And dull.

That guy Brian is sooo undertaining.

Undertaining by BryGasm March 9, 2010

underline 

To cherish someone forever

I’m going to underline you.

underline by Firewater2805 November 19, 2020

underbrained 

1. The utter failure to employ sufficient intelligence in any given context

2. Acutely lacking sufficient intelligence for use in any given context

Esp. in positions of social responsibility/power.

e.g. Kit on Palin: "That woman is dangerously underbrained"

underbrained by Føx January 19, 2011