Lamp

v.

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

To deliver a heavy, forceful punch or physical blow to someone.

In use

He was lip talkin' so I lamped him one in the jaw!

Posh English

He was being impertinent, so I gave him a thoroughly sound thump upon the chin.

Same phrase, other counties