Touched

n.

Heard in Carlow, Kilkenny and Galway

Describing someone who is mentally unbalanced, eccentric, or acting in a foolish manner.

In use

Are you touched in the head or something, to be carryin' on like that?

Posh English

Are you entirely unhinged or perhaps suffering from a lapse in reason to behave in such a manner, my good fellow?

Same phrase, other counties