May have multiple meanings:

1. When describing a stupid person, or
2. When describing a very large rain storm.
1. You're so dumb you couldn't pour piss out of a boot with the instructions written on the heel!

2. Look at those clouds, its about to pour piss out of a boot!
by 7h0rn3 April 5, 2009
Get the pour piss out of a boot mug.
a phrase repeated again and again in the popular TV show South Park - where one of the character's tourette's tick is repeatedly screaming variations of "piss out my ass!"

also, when the character is screaming a variation of this phrase, he will turn his head to the side and cover his mouth.
ass...ass!!! piss, the ass!!
ass pissss!! peeiissss!
ass??? piss in the ASS!!!
peeeeiiiiissss coming from my aaeeeeiiiassss!!!!!!
piss....pissss!! piss out my aeeeasss......PISS OUT MY ASS!
by JackBauer133 April 13, 2011
Get the piss out my ass mug.
Extreme diarrhea. Nearly pure fluid generally yellow or light brown that comes forth while attempting to shit but finding out you have this problem. Shit that actually is more like piss
Scott: "After we had that $4 all-you-can eat Chinese buffet last night, I woke up with massive stomach cramps. I went to the can and was pissing out of my ass."

Max: "yea, I had the same problem, I went to the can to take a leak, finished, fealt I had to shit, turned around, sat down and ended up pissing out of my ass!"
by psiscott April 9, 2006
Get the pissing out of my ass mug.
Beating someone to a pulp. Knockin' your ass out
Motha fucka, you step to me again.....I'm gonna beat the piss out of you!!
by Da Skrill July 10, 2006
Get the beat the piss out of you mug.
in one episode of south park, le petit tourette, there is a character that repeats the phrase piss out my ass and piss in the ass. this is followed by numerous recitations of the word piss and ass
piss.....ass....piss out my ass
by zzoldan January 6, 2008
Get the piss out my ass mug.
Another way to say diarrhea; you have such bad diarrhea that it is like water, and you can literally force it out, like piss.
Eating all that fried chicken made me piss out my ass.

I've been pissing out my ass for the past 24 hours.
by Paul_M_Mason October 25, 2007
Get the piss out my ass mug.