meh According to Merriam Webster, meh is:
—used to express indifference or mild disappointment
First Known Use of meh: 1992
adjective
1 : not impressive : so-so ·a meh documentary
2 : apathetic, indifferent ·the movie left me feeling meh
The word is often uttered with a shrug of the shoulders and a deprecating expression on the face. I always assumed that the origin of meh was Yiddish, and was surprised to find, in meh, Wikipedia that its origin is speculative:
The origin is unknown. Some have speculated that the term's origin is Yiddish because of its similarity to the interjection "feh",[3] which appears in the 1936 Yiddish song Yidl Mitn Fidl. In Alexander Harkavy's "Yiddish-English-Hebrew Dictionary" the word is treated as a bleating or baa sound. Hooray for Yiddish, by Leo Rosten uses the word "mnyeh", which is speculated to be an early variant of "meh".
The first use in 1992, if correct, is a point against a Yiddish origin, unless the word was created in Yiddish in recent times, akin to the creation of many English words in recent times.
Whether its origin is Yiddish or not, my impression, from a lot of reading, is that Jews have enthusiastically adopted the word, although I cannot cite a reference.