When you take a huge dump into the
water tank, hence the name upper decker.
Y'all have probably seen many more definitions and guides, but I'm gonna teach y'all how to do one even better.
1. Follow the typical steps to taking an upper decker and take all neccessary precaution to not get caught.
2. On
top of shitting the most horrendous turd you can manage into the
water tank, also dump in a significant quantity of high calorie
food or drink (like bread, meat, highly sugary drinks, etc). This gives the microbes in the shit
food to feed on, making the toilet even more nasty on top of the shit thats in there.
3. Profit
Man, that dude Jim was so
mean last
night. I can't wait to see the look on his face once he finds out about the Upper Decker Moldy Edition TM I did to his upstairs
toilet
