See also Hippy Piss. For some reason some editor didn't like the definition when it was submitted as "hippie piss," but I'm trying again. Anyway, it's a Southern Californian expression used to describe the smell of patchouli oil.
Steve said that the guy with dreadlocks smelled like hippie piss. Paul thought that the expression was clever and descriptive, so he submitted it to urbandictionary.com, but some asshole editor quashed it, so Paul resubmitted it as "hippy piss" and must have gotten a better editor. Anyway, that Earth-Day-loving, incense-burning, tie-dye-wearing guy with dreadlocks did smell like hippie piss, and no editor is going to tell me otherwise.