As with a traditional Upper Decker (where the attacker poops into the reservoir of the victim's toilet), but with the addition of gelatin powder, which, coupled with the cold water temperature and cool porcelain construction of the reservoir, causes allows the mixture to set into a poop jell-o which requires the victim to manually scoop it out
"Hey John, did you hear? someone left Tim an Atomic Upper Decker during the party on friday!"
"Wow, he must have really pissed someone off."
"Wow, he must have really pissed someone off."
by Judge)Mental December 19, 2017

by JLC84 October 30, 2007

An extremely volatile expulsion of bodily fluids and or particles from one's anus. Usually done onto another individual's chest or face.
Dude what's that smell?
Well, my girlfriend told me she wanted to try an Anal Atom Bomb, she was naked so I just went with it.
The fuck?
Yea, and that was four months ago.
Well, my girlfriend told me she wanted to try an Anal Atom Bomb, she was naked so I just went with it.
The fuck?
Yea, and that was four months ago.
by Sodomy Boy October 26, 2010

by obiwankenobi April 2, 2010

You do an atomic bomb except you are above a woman. Then climb down off of whatever the hell you where on. Then proceed to flattening out the shit on her back with your ass. Just like in the cleavland steamer.
Me: Stand still, Im going to get the step-ladder
April: Why would we need that?
Me: Im going to give you an atomic cleavland steamer
April: OOOOOOOO sounds like fun!
April: Why would we need that?
Me: Im going to give you an atomic cleavland steamer
April: OOOOOOOO sounds like fun!
by PlasmaNova June 19, 2008

Similar to the atomic push-up instead of telling them to do a situp you have them get ready to do a push-up tell them that its been proven impossible to do a push-up with something on their neck (example a 1 pound weight on ur neck)with a blindfold on. then blindfold them, tell them not to push down and to get ready to push down when you say 3 (while doing this have other person put ass where their face is going to be now say three and push their head into others ass while removing blindfold with other hand keep their face there for awhile or do w/e idc works better than push up because they get more ass in face **warning may result in pissed off chump with a face full of ass**
by Bluemoon11 February 4, 2007

Preform a standard pressed ham (I.e) press your bare ass tightly against a clear panel "glass etc" with a tight seal and let loose with a preferably powerful fart
by Dick n' omo May 12, 2013
