A name you give to a place that is perfect for urinating.
When your at a party and you look all around for a place to piss, and you discover the perfect spot.
Dude 1: Oh man, I've really got to hang a piss.
Dude 2: Shit man, go down that path and fang a right when you hit the bridge, it's Pisstopia there.
Dude 1: Ken ay!!
Engaging in a frustrating pursuit that consumes more effort that it is worth. The idea is that "pissing upside down" is an ineffective way to do something very simple, and likely results in getting wet.
"I just wanted to get a quart of oil out of the garage but I bumped the boxes of scrapbooking supplies, which knocked over a bottle of brake fluid that split open and is getting everywhere. Now I'm pissing upside down."