Aye

n.

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

Yes or It is. Used with a verb rather than as an answer on its own.

In use

Will you be around today for the match? I will, aye." "She will aye, she will in her arse!

Posh English

Shall you be in attendance for the match today? I most certainly shall.

Same phrase, other counties