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1.
A mishap generally involving the mass consumption of alcohol and a misdirection of urine to an area other than the toilet. This usually occurs as the result of an alcoholic stupor.

Can also apply to any other misadventure in some way linked to piss.
Man, Mark was so wasted at his birthday party last weekend that he woke up in the middle of the night and peed all over his computer. It was quite the pisshap.
by bandit bob August 09, 2009
 
2.
a lesser form of pissaster
A pisshap is bad enough, but watch out for pissasters.
by Figleaf23 August 19, 2009
 
3.
An mishap involving urine, usually after a mass amount of alcohol has been consumed.
OMG, Did you hear of Ronnie's pisshap the other night? "He freakin peed on Alan's kitchen table!"
by WasThere August 14, 2009
 
4.
An mishap involving urine, usually after a mass amount of alcohol has been consumed.
OMG, Did you hear of Ronnie's pisshap the other night? "He freakin peed on Alan's kitchen table!"
by IWasThere August 14, 2009