What is Yamouen/Yamoen?


I've been hearing something like yamoen for the meaning of "can't be helped".
Similar to shouganai from my guess. I can't find it in any dictionary. Am I
getting the word wrong or is it a colloquial Kansai dialect?

It's weird because there's this Tokyo-ben character in a show who just
suddenly used it out of nowhere so I don't think it should be a dialect.

Thank you,

