How to spell what sounds like "ish" or "eesh"? [duplicate]
The interjection you are describing is commonly spelled "eesh" and expresses "distaste, disgust, or trepidation" according to its Wiktionary entry (which is backed up by quotations from books published in 2013 and 2014).
Merriam-Webster does not have a definition of eesh, but it does have one for sheesh:
interjection
—used to express disappointment, annoyance, or surprise
Wikipedia does list eesh:
- Expressing distaste, disgust, or trepidation.
And it points to both sheesh and yeesh as being related.
Eesh may or may not have come about as a shortened version of sheese, nor is it entirely clear if their specific uses are different. (Personally, I can more or less substitute one for the other without really sensing a difference.)