Lamp

adj.

Heard in Kildare, Kilkenny, Cork, Wexford, Galway, Derry, Limerick and Down

To strike, punch, or deliver a heavy blow to someone.

In use

I'll lamp him over the head if he doesn't shut his gob!

Posh English

I shall strike the fellow firmly across the pate if he does not cease his jabbering!

Same phrase, other counties