Clatter

v.

Heard in Westmeath, Kilkenny, Dublin, Tipperary, Waterford, Cork and Galway

To strike someone forcefully, typically with an open hand.

In use

I pinched her arse, and she gave me an awful clatter on my ear

Posh English

I pinched her posterior, and she delivered a most fearful smack upon my ear.

Same phrase, other counties