Ou'witchya!
Heard in Waterford
If a friend says that they are ou'withchya (out with you) then they mean they are no longer your friend. Preceding the phrase with blackspoh (black spot) is even more serious.
Ye robbed me bag a' cans ye bollix, I'm blackspoh ou'withca now ye cuncha!
You purloined my satchel of lager, you absolute tightwad, and I am permanently finished with your acquaintance, you dreadful scoundrel!