upper deck save 

n. Use of the last flush of an unpressured toilet to remove unpleasant matter.

With most toilets, a reservoir sits above the main bowl. This reservoir fills at the time of the flush, and remains full (barring leaks) until again flushed. This reservoir is commonly referred to as the upper deck.
When it becomes necessary to make a deposit in the tank of the toilet, circumstances do not always allow for proper checking of water pressure. While a sink won't run without water pressure, a toilet will often allow one last flush. Use of this flush to remove an especially unpleasant deposit is reffered to as an upper deck save.

"I took a huge dump before I realized the water was out. Luckily I was the first in, so I got an upper deck save."

upper deck save by Jordan Mills April 15, 2004

Upper deck baseball 

The baseball team that will destroy anybody

Damn upper deck baseball just kicked our ass

Upper deck baseball by Udcbaseball April 21, 2021

Upper deck foul 

When you get to your girlfriends house with a hard dick in your pants expecting it to get satisfied. But when you arrive some other dude’s sitting on her couch & she tells you it’s over and doesn’t want to see you again. You excuse yourself to use her bathroom. Drop a deuce in the tank on the back of the toilet jerk off on the toilet seat and leave.

You’re hanging with your Bro’ he says he dude how did your hot date go last night with your little hottie? And you say “Dude, I thought I was getting some action, but she told me it was over“. So I had no choice but to declare an upper deck foul before I left. Let her new umpire confirm it.

Upper deck foul by Chucklito89 July 21, 2023

Slatering the upper deck 

This technique is for the most skilled of slaterer's. One must be nimble and quick in order to accomplish this feat. It involves combining the classics "slatering" and the "upper decker." You sit on the top of the toilet in the AC slater position (from saved by the bell) and take a hot steamy dump in the upper deck.

Jorge: Hey man, what's wrong. Why is your face all bruised on your left side?

Carlos: Shit man, I was slatering the upper deck on your can and I fell off.

Jorge: What the hell does that mean man. What's that brown shit on your shirt and pants.

Carlos: Shit.

Jorge: You are f'd man. Why do I hang out with you.

Slatering the upper deck by Teratoma69 June 14, 2011

Hitting one to the upper deck 

Taking a crap in the tank part of a toilet

I hit one to the upper deck, whoever flushes next is in for a real surprise

Hitting one to the upper deck by gdollar January 3, 2004

The upper deck

The act of defecation into the tank above someone else's toilet.

"Dude, Jill told me to leave, so before I went, I gave her the upper deck."

The upper deck by Jason Spires April 19, 2004

batting in the upper deck 

Having intercourse with a female's chest area.

I really like Susan's breast, I know if I was with her I would be batting in the upper deck.

batting in the upper deck by superman111 October 27, 2012