To express delight that something went awfully wrong for someone (they might have had it coming to them or deserved it in someway, or you might dislike them). For example if an insult they used backfired.
pronounced "roort" south Derry term used to describe a "rare" or "rare-boy" e.g. "did you watch the apprentice? Yer man from Belfast is a pure reurt hi, so he is"
