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1.
A period of heavy or binge drinking
That was quite a pissfest last night!
by Snellite April 09, 2008
 
2.
Gina, Phil, and Craig urinating in each other's mouth wearing RainCoats, One Umbrella, and a Birthday Suit.

2guys1girl1umbrella1raincoat.com
Gina pissed in phil's mouth. It was a total pissfest!
by djruiner September 04, 2008
 
3.
a period of time marked by outrageous events and a high volume of collective irritation.
That refugee camp was a total pissfest.
by reaeaeat July 30, 2008