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Used as an indicator that the enjoyment of a situation for a given event or time period could not be improved upon. Normally cited by a country dweller from the northern regions of Northern Ireland, United Kingdom.

Less frequently, it is often adopted by Town or City dwellers in ridicule of their Country dwelling neighbours.
Hi boy, ye missed a quare night last night hi...it was craic ninety"
by Father Dong July 12, 2010