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

underfuckingstand 

When you don't understand something and you are super pissed.
When you don't feel like saying "fucking understand"
When fucking understand just doesn't quite display the needed emotion.

"I don't underfuckingstand why your acting like this"

underfuckingstand by Desiree Aho January 9, 2008

Upperdecking 

Removing the lid of the back of someone's toilet and shitting in the clean water. Results in shit running into the boil with every flush

That bitch pissed me off, so I upperdecked her shitter

Upperdecking by Dan April 5, 2004

underfuckingstand 

underfuckingstand - Understand, with "Fucking" inserted in the middle, making it an exclamation of frustration or, in some cases, a joking statement.

"What part of this do you not underfuckingstand?!?" or "I dont underfuckingstand!"

underfuckingstand by Steve October 24, 2004

Upperdecking 

This one takes practice. This maneuver requires a toilet with a tank above it, like the ones in most homes. Instead of crapping in the bowl, you shit in the tank. Now don't flush. When the following victim flushes, the rancid waste fills the bowl. If you play your cards right, it may ferment. Great prank for those lame partys.

"I gave that toilet a nice upperdecking, Just wait till she comes outta there"

Upperdecking by CharlesVA August 5, 2006

Upperdecking 

Using the restroom, going number one or two in the water tank of a fellow man's toilet. when he flushes the pee or shit flows out.

The other night we were upperdecking, it was funny as shit.

Upperdecking by douchebagness May 16, 2007

underdesking 

The office skills utilized by those who prefer to smother their bosses undersides with their noses and kisses.

Although Jill's typing and filing skills lack any true ability, her underdesking talents may be the reason she is till employed.

underdesking by Tim Wethers May 1, 2006