Blue arse fly
Heard in Tipperary, Dublin and Waterford
A bluebottle fly, or to move about frantically; also to become excited or angry.
Yer in early paddy, be gor I am, herseff was goin round like a blue arse fly this mornin, so I had ta leggid.
You have arrived early, Paddy. By Jove I have. Her good self was scurrying about like a frenzied bluebottle this morning, so I was obliged to depart without delay.