1) (sense 1): Interjection signifying pain, weariness, disgust, resignation, etc. Very often part of oy vey or
oy vas mir. Compare to English Jeez. (from Yiddish "oy", probably from
old German; probably
cognate to English "oh").
(sense 2): Interjection signifying annoyance. Very similar to sense 1, but more annoyed than resigned. (Probably from Cockney accent of English "Hey".)
(sense