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1.
when something is so funny that you literally piss yourself laughing.
dude 1: did you see the sketch that billy connolly did about putting a condom on inside out?

dude 2: haha, yeah it was piss funny.
by Jonny Foxwell September 13, 2007
 
2.
Hilarious, very amusing
www.pissfunny.com is pissfunny
by Whizz May 04, 2004
 
3.
hilarious. Irish colloq
That guy tom he thinks he is pissfunny
by Sean October 09, 2003