Clem

adj.

Heard in Offaly, Mayo, Sligo, Longford, Meath and Galway

A foolish, simple-minded, or gullible person.

In use

Yer some clem entirely for signin' up to work on yer day off!

Posh English

You are a remarkably foolish fellow for agreeing to work on your scheduled day of rest.

Same phrase, other counties