Omona (어머나) — which can be interchangeably used with “omo” (오모) — is a Korean interjection which means something akin to the English expressions “Oh my!”, “Oh my gosh!” or “Oh my god!”, denoting surprise. Its use is closely related to “aigoo” (아이구), however omona appears to have less of a negative connotation according to some sources.

It is notable by its frequent use in Korean dramas. As defined on Dramafever, it is “the ‘OMG’ of Korea. One usually uses this term when wanting to make a current situation even more dramatic. This term is best used when you find out something extremely surprising and shocking.”

It is not in any way related to the brand of laundry detergent made by Unilever.