Banjaxed

n.

Heard in Galway, Kilkenny, Cork, Cavan, Tipperary, Fermanagh, Limerick, Donegal, Offaly, Longford, Kerry and Down

Thoroughly broken, ruined, or wrecked beyond repair.

In use

The gearbox on the tractor is completely banjaxed.

Posh English

The transmission mechanism of the agricultural tractor is thoroughly ruined.

Same phrase, other counties