Tool

n.

Heard in Cork, Limerick, Westmeath, Dublin, Galway, Offaly, Waterford, Kildare and Donegal

An absolute fool or an utterly useless specimen of a person.

In use

Yer an awful tool wearin' shorts in dis Freezin' weather la!

Posh English

You are a dreadful fool for wearing trousers of such brevity in this glacial weather, old boy!

Same phrase, other counties