I wouldn’t sweat it - that phrase is used all the time in Ireland, which the author would know if they’d bothered asking some Irish people. There is even a wel

I wouldn’t sweat it - that phrase is used all the time in Ireland, which the author would know if they’d bothered asking some Irish people. There is even a well know Paddy Wagon bus tour company with a giant Leprechaun on the side - no one bats an eyelid.