PHThe word "jaywalker" means a "walking rube."
According to Merriam-Webster, the word "jay" was an old term used to describe someone as a "greenhorn or rube." In other words, an unintelligent, possibly foolish person. Sometime in the early 1900s, the word "jaywalker" was first used to describe pedestrians crossing the street at random points, put themselves and drivers at risk of an accident.
(S) bestlifeonline