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 Oxford English Dictionary also lists meh, with definition very similar to that of M-W. However, the OED suggest an earliest use of "1928 or earlier." Meh has made it into the NY Times, as quoted by the OED:
2012 N.Y. Times (National ed.) 1 Nov. b13/1 Who else could they root for? The Chicago Bulls? Impossible. The Boston Celtics? Unconscionable. The team in New Jersey? Meh
and into other mainstream publications
2010 Time Out N.Y. 20 May 52/1 While this seems like an also-ran collection..even meh Picasso is better than a lot of the stuff out there.
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.