The truckers in Convoy were really Valley Girls? 
Surfer slang.
Was that the skit with John Belushi as Vito Corleone in group therapy?
There are elements of “Valley Girl” talk that may have been around since World War II. In particular, uptalk may have originated in Australia or New Zealand:
In fact, uptalk seems to have appeared everywhere at once. Besides the U.S., Australia, and New Zealand, there are also indications of it appearing spontaneously in the U.K., Ireland, Canada, and South Africa.
To elaborate slightly: when the wave crests and begins to roll over above you, I am told that you are “in the tube” as the shape of the wave around you is, literally, tubular. Successfully riding a wave in this manner is, I am told, both a sign of advanced surfing skills and extremely thrilling in and of itself. Hence, by extension, really good things are said to be “tubular.”
Disclaimer: Knead, like Charlie, don’t surf.
Frank Zappa’s “Valley Girl” (1982, on the album "Ship Arriving Too Late to Save a Drowning Witch) featured his daughter, Moon Unit. That was the first I heard Valley-Girl-Speak, and it was then that it became part of the larger culture, I think. The next year was the 1983 Nicholas Cage movie, Valley Girl.
mikews99, did you just impersonate one of my sisters? 
Seriously, though, my best friend in 6th grade talked exactly like that. I picked up some of it, to the point that I almost typed “totally talked like that” in the previous sentence. You can take the girl out of the Valley, but you can’t take the Valley out of the girl.
People from Newcastle in England start low and then get progressively more high pitched.
The only trouble is that non “Geordies” cant understand a fucking word of what they’re on about.
I notice bits of Valley girl/surfer talk popping up in my vocabulary every once in awhile, and I swear, it’s like totally unconscious.
Come to think of it, I grew up in Southern California during the '80, so I probably absorbed some of that dialect by accident.
I was walking around LA (no, really, they have sidewalks) in 1987 when I overheard this snippet of conversation: “I think he’s really into me? Because the other day? He like gave me hecka flowers and shit?”
I’m from New Jersey, it took a while to process that those weren’t questions and that “hecka” was an intensifier. The “and shit” I got.
Every season on DVD so far of House contains a scene between Cuddy and Cameron talking to each other like Valley girls. FYI, just for fun.
Yes. Thank you. I could not for the life of me remember the main character in the skit.