An expression that implies one is being overly subtle while doing something common - such as talking. Similar to the way one would urinate on the bowl of a toilet or urinal to avoid creating an audible noise.
I want to call my boss an asshole, but I can't. I'll just piss on the porcelain about it for self-satisfaction.
v. When listening to a story your girlfriend or boyfriend is telling you over the phone, you find other means of entertainment by having the phone on one ear and a headphone connected to you computer playing either music or voicechat to create the illusion that you are paying attention to the story being told.