Mog

n.

Heard in Cork, Limerick, Clare, Waterford and Donegal

Person of low intelligence. Also: Fool/ugly. Also: Fool or dope.

In use

Christ, he's some mog" "Gway ya mog/ur wans n awful mog" "He is some mog like

Posh English

Good heavens, that fellow is a perfect imbecile.

Same phrase, other counties