Gombeen

n.

Heard in Tipperary, Kilkenny, Cork, Waterford, Limerick and Cavan

A fool or idiot.

In use

Tom: "Did you ever see that fella Frank?" John: "Yeah, he is some gombeen"

Posh English

Tom asked whether I had ever observed that fellow Frank. John replied that he was a complete buffoon.

Same phrase, other counties