You know the one I mean, but it’s hard to describe. Think Tommy Chong, Otto the Bus Driver, or - going way back - that guy from the TV commercial for the Freedom Rock album (“Hey, man is that Freedom Rock? Well, TURN IT UP!”)
When you mimic that hippie stoner voice, what exactly are you doing? What is it called? Is it an accent? Is it a regional thing? Is it based on a character, or did real hippie stoners actually speak like that?
The article goes into details about the origins of the Valley Girl and Surfer Dude accents, as well as the Chicano English influences, and has a lengthy section on the California Vowel Shift.
I’m not sure it’s an accent so much as just the slurring and slow cadence typical of a heavily stoned speaker. Possibly with some added degree of long-term brain damage from drug overuse.
The funny thing is, I’m from Toronto, and I actually had a classmate in high school who seemed to speak with the “surfer dude” accent. He reminded me a lot of Michelangelo from the Teenage Mutant Ninja Turtles cartoon. I wonder if it wasn’t just some kind of affectation.