Jaywalker

If you go back far enough, you will find that one of the early definitions of "jay" is: simpleton or stupid person. Our present definition of "jaywalker" is someone who doesn't use the designated crossing areas to cross a street. In other words, a jay (stupid person) is apt to do stupid things (cross at unsafe or illegal places).

So don't be a jaywalker. And try not to be a jay at home or the office.