Three units of residential housing stacked on top of each other. Ubiquitous in the urban areas of central and southern New England, especially Worcester, Massachusetts. Also known as triple decker.
"I grew up in a three decker on Grafton Hill. My grandparents lived on the first floor and my aunt lived upstairs."
by John.F.Murphy March 15, 2008
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The act of taking off the back lid of a standard toilet, hovering your anus over the opening and shooting diarrhea into the tank water. You must then wipe with TP and leave the TP in the tank. Adding red food dye to the tank is called BUD, or Bloody Upper Decker. Either with or without the dye, when the next person who uses the toilet flushes, the water that refills the bowl will be the most vile, horrific, stinky fluid known to man. Woman have been known to scream and run out of the toilet as they think their insides are coming out. Key stuff here.
"I was working a night party at that rich cunt's house. As the party was ending, I asked the beeotch if I could make a sandwich. She yelled at me in front of her guests that I will "eat with the rest of the hired staff at the end of the night!" A simple no would have been fine. For a thank you gift, I pumped a gallon of milk into my lactose intolerant ass and dropped and Upper Decker that cunt's main bathroom. Later, I Bloody Upper Decked (BUD) the upstairs daughter's fine china toilet. After that I raw dogged one of the workers and bailed, yo.'
by Dick Smartly July 3, 2014
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The most beautiful, amazing, perfect girl you will ever meet. She will keep you up at night just thinking about her. She will be your first, and your last thought every single day. From the first glance you will fall for this girl, with her perfect personality, perfect eyes, perfect smile, perfect everything! She will make you fall madly in love with her, and you are going to wish she is your wife, even before you know all about her.
Damn, Krysta Decker is so perfect!!!

Krysta Decker is one day gonna be my wife!!!
by Wazowski_Pola May 31, 2017
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The act of shitting into the tank (or upper portion) of a toilet. Done as a prank, it results in at least four foul flushes (also known as a "3-F qualifier") afterwards.
"Man, I'm gonna fucking puke."

"Dude, how come?"

"Man, someone dropped an upper decker in the toilet, and the water splashed my ass and sack."

"Dude, that sucks."

"Man, I think I got a piece of corn stuck to my sack!"
by papamikedelta October 24, 2009
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A party trick
The trickster takes a dump in the cistern of the host's toilet, resulting in rusty water for months unless the offending turd is fished out and flushed away.
I went to that bastards party the other day, drank his beer, fucked his girlfriend and left him a top decker for the morning.
by Squealpiggy September 19, 2005
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As per the John Waters' film A Dirty Shame, an upper decker is the act of defecating in the tank of the toliet.

(As per my intoxication, an upper decker is my ability to write this while in the act (I'm currently the upper deck).)
"I started doing upper deckers, shitting in the top tank of the toliet, where no one would ever look to find the odor . . . "
by iloverobots01 January 9, 2006
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using the water retaining bowl of the toilet, instead of the toilet itself.
that beyotch pissed me off, so I ate 3 large burritos, took some Ex Lax, went over to her house and left her an upper-decker to deal with.
by Amanda Huggankiss August 2, 2006
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