Shtop/stop

exp.

Heard in Roscommon and Galway

A somewhat nonsensical term in reply to a statement or question. It doesn't really hold huge meaning, it just conveys shock, agreement, or usually gives the message that things are bad/worse.

In use

Maggie: "How are you keepin'?" Finn: "Oh shtop, I'm killed out!"

Posh English

Good heavens Finn, I am completely exhausted.