It doesn’t have kedusah per se but the idioms, colloquialisms and euphemisms are so based on Torah, chazal and Torah haskafa that Yiddish has enormous value in that sense.
To give a random example. (I can think of many, many others)Someone who was picking up Rav Moshe Feinstein to drive him somewhere told him “In Europe (Yiddish) we said the ba’al agalah is here. In America(English) we say the car is here” Rav Moshe commented that this is a very sad difference. In Europe (Yiddish)the focus was on the person (the ba’al agalah) who is waiting outside.In America(English)the focus is on the car and your ability to get a ride.
Ba’al Agolah is Hebrew so this idiom definitely wasn’t picked up from non-Jewsih society.