That Robin Williams is making fun of here [https://www.youtube.com/watch?v=0uXjLR0WtZM](https://www.youtube.com/watch?v=0uXjLR0WtZM)
It is an exaggerated version of an accent that I’ve only heard in films/shows from this era. A gen x “dude” accent that I’ve never really heard post 2000. Where does it originate from?