Aye

n.

Heard in Monaghan, Donegal, Louth, Offaly, Limerick, Derry and Roscommon

A common affirmative response equivalent to yes, or an informal greeting.

In use

Aye, your man just bought a brand new lorry down in the town.

Posh English

Yes, precisely, your fellow just purchased a brand new commercial lorry.

Same phrase, other counties