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1.
The act of holding ones urine for an extended period of time and the forcing it out at a high speed and velocity, often for the purpose of blasting caked-on feces from the walls of toilets.
Timmy gritted his teeth and blasted the remaining shit off the walls with a power piss.
by kindpastor January 18, 2007
 
2.
when you are trying to piss with a bone.
sometimes after i make out with her i have to power piss
by Spike February 21, 2005
 
3.
The act of holding ones urine for an extended period of time and the forcing it out at a high speed and velocity, often for the purpose of blasting caked-on feces from the walls of toilets.
Timmy gritted his teeth and blasted the remaining shit off the walls with a power piss.
by kindpastor January 18, 2007
 
4.
it’s when you take the longest, fastest piss of your life, it’s been a long awaited one and it comes out like a fire hose and you have to hold on to the sides of the toilet from how fast it shoots out of you. In the end you’re out of breath and the little piss left is just dripping out of you.
For Example:
"Hey Lexi, I'll be right back, I gotta go take a power piss"
"Jeezus man, be careful"
by Evangeline Ingle July 06, 2013
 
5.
Any potent 'falling down juice', especially those with a combined high alcohol and high caffeine content . E.g. Dragon Soop, Buckfast Tonic Wine, Mekong whiskey + Thai Red Bull in a plastic bucket.
Everything was going fine until I got onto the power-piss, then I knocked over the buffet, fell into the cake and made the bride cry.
by Good Ol Jasper September 26, 2014