I've heard this word a lot of times, but still don't know how to write it down. It's used when you want to show some kind of disgust, or something like that. It sounds like "ish" or "eesh".
I've heard it used like so:
Ish, calm down, will you?
Or:
– I've heard they're re-writing that book.
– Ish, I've always hated it.