Sorry, what Ive been hearing and it has been noted in articles, is the lowered pitch at the end of the sentence in young womens speech patterns.
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I believe the term they use for this is “Vocal Fry” Quite annoying, and frankly a bit silly.
Ah yes, the Vocal Fry: https://www.youtube.com/watch?v=UsE5mysfZsY
Thanks for putting a name to this ... the pattern sounds like nails on a chalkboard to me.