Upper Desker 

When your co-worker is feeling down and you shit on his/her desk to cheer them up.

1. Juan was overcome with sadness, so I offered to give him an upper desker.

2. After giving Cheryl an upper desker, she needed gasoline, a flamethrower, and a therapist to remove the memories.

Upper Desker by Hitokiri_Dan July 20, 2011

Upper Desker 

The act of pooping on an upper tier of a multi-tiered desk.

Sheila was being a huge bitch today so I waited until everyone left the office and gave her an upper desker

Upper Desker by Shitstorm15 October 21, 2010

the upper decker 

the act of deficating in the upper tank of ones toilet leaving a foul stench undiscovered with the remnants of muddy water

before i got kicked out of that bar last night i gave them the upper decker

the upper decker by face vol.4 May 23, 2009

Upper Decker

Step 1) Make sure nobody's around.

Step 2) Quietly open the lid of the upper-section of the victim's toilet.

Step 3) Quietly place the lid down on the floor.

Step 4) Then take a nice shit in the upper-section of the toilet without letting anybody hear you.

Step 5) Wipe your ass.

Step 6) Place the soiled toilet paper in the upper-section of the toilet or in a drawer or magazine.

Step 7) Slowly lift the lid off the floor with your fingers under it and carefully bring it over to the toilet.

Step 8) Here's the hard part; with your fingers under the lid
slowly place the lid on the toilet. No false moves or you're screwed.

Step 9) Leave and don't let anybody see you. Just bail as quickly as possible.

Step 10) Mission accomplished.

Plumber: It looks like you have feces in your toilet's tank.

Victim: It must have been an upper decker.

Plumber: Yeah right. Its already clear that you're stupid enough to shit in there!

Upper Decker by Mike_Litoris June 29, 2011

Upper Decker

The act of taking a dump in the tank of a toilet.
Step 1: Quietly sneak into the bathroom unseen
Step 2: Carefully remove the top of the tank. Note the porcelain tank top is very delicate and will shatter if dropped

Step 3: Climb on the toilet, drop pants and sit on the tank. Imagine you are a bird sat uptop your nest, sit very softly or else the tank may break and the operation will be compromised

Step 4: Take a monster shit. I'm talkin like a goddamn mudslide out your asshole

Step 5: Whipe and throw the tp in the tank too for good measure and put the top back on

Step 6: Return to the party and act like nothing ever happened, if you leave right away you will draw suspicion to yourself
Step 7: Enjoy the host's reaction when they see that Mount Vesuvius just exploded in their toilet tank

Friend: Yo did you hear, Julia is having a party this Saturday
Me: I dislike her very much, I'm gonna drop an Upper Decker at that party

Upper Decker by bowelsmovin June 25, 2017

upper decker

The act of defecating in the upper tank of the toilet. When the next poor unsuspecting person flushes the toilet they get a bowl of beef stew. the upper decker is a weapon of terror and should only be used on people who deserve it.

My friends x-girl friend had a party and she left whith some other dude who looked like the fonz "Heyyy!". So I took it upon myself to leave her an upper decker

upper decker by The Mad shitter May 14, 2003

Boujee Upper Decker 

Taking a shit in another person’s essential oil humidifier without telling them. Usually as a form of retaliation in which a classic upper decker just won’t cut the mustard.

“I know I had to get back at that twat waffle after he cheated on me with my sister. So naturally I left him a boujee upper decker when I moved out.”

Boujee Upper Decker by Gettin' It.... March 8, 2022