when two people or a combination of people and small rodents ingage in a crocidle pile up when one is missing half of one of their index finger and both participants are at the highest point in the tree with a jar of pure canadian maple syrup.
tree piss is a rare occurance ive only experienced once or twice.
1) The sap that comes out of a tree.
2) A really tall guy going for a pee.
3) The piss on a tree left over by a guy or many guys who've done their buisiness there.
4) An insult related to the words slut, skank, whore, biznatch, hoze-bag, etc.
Courtney is such tree piss, there's no guy who hasn't done her over atleast once.