A classic dad insult for someone who is moving very slowly or not at all, particularly in traffic. Great for use in traffic when the
guy in front of you is just sitting there with a
green left turn arrow.
It's origin might be drawn from a situation where someone is so slow or
lazy, that they pee their pants while sitting on the couch, hence sitting in a puddle of their own pee. But the word could just as easily be from a random combination of words thrown together in the heat of road
rage.