3piss
The situation that arises when 3 acquaintances urinate on the same item or area, causing an array of urine and/or/ a downhill trickle. In order to be a 3piss, 3 people (no more, no less) must all urinate on said object within an hour of one another to make it valid.
I can take a 1piss all day; A 2piss is getting up there, but a 3piss is absolutely fucking magical