Upperdecking Edit Meaning

1.

Removing the lid of the back of someone's toilet and shitting in the clean water. Results in shit running into the boil with every flush

That bitch pissed me off, so I upperdecked her shitter

See Dan

2.

This one takes practice. This maneuver requires a toilet with a tank above it, like the ones in most homes. Instead of crapping in the bowl, you shit in the tank. Now don't flush. When the following victim flushes, the rancid waste fills the bowl. If you play your cards right, it may ferment. Great prank for those lame partys.

"I gave that toilet a nice upperdecking, Just wait till she comes outta there"

See shit, toilet, upperdecking, tank, ferment, nasty, prank, joke

3.

The malicious act of making doodie in the water tank of a toilet, thus contaminating the toilet's clean water supply.

See ee

4.

Using the restroom, going number one or two in the water tank of a fellow man's toilet. when he flushes the pee or shit flows out.

The other night we were upperdecking, it was funny as shit.

See upper, deck, shit, poop, toilet