Mighty

adj.

Heard in Sligo, Mayo, Kerry, Kildare and Tipperary

Excellent or splendid. Often used as an all-purpose positive response.

In use

Answer for everything - How r ya? - Mighty. Did ya have a gud nite - Mighty!

Posh English

How are you? Quite brilliant. Did you have a thoroughly splendid evening? Quite brilliant.

Same phrase, other counties