Famously seen in: Every teen show and movie since the 1980s
The valley girl voice has been satirized for years, but the original satire was Frank Zappa's 1982 song, "Valley Girl." Practically coining the term, the song is interposed with a valley girl's voice talking while using terms such as "totally," "rad," "super" and, of course, "like." A movie also titled "Valley Girl" was released in 1983, starring a "punk" Nicholas Cage.
Unlike most other trends on here, Valspeak has not died down. If anything, it became aspirational in the 1990s thanks to "Clueless." Even 40 years after the song, people have a hard time not inserting "like" into every other word.