We have it too in The Netherlands "wildplassen", since the Dutch "wild" (as in "in the wild") can indeed also be translated as "wild" (as in uncontrolled), the standard response when caught is "No officer, I was, in fact, peeing very calmly."

Hey! A Pinkelbaum can use some nitrogen.

There's usually a little more dignity involved, with people generally at least trying to be discreet.