Rotten

n.

Heard in Armagh, Kilkenny, Wexford, Sligo, Kerry, Cork, Galway and Limerick

Ugly, or something that tastes unpleasant.

In use

Shes rotten hi!' or 'that meat is rotten

Posh English

She is remarkably unattractive, or alternatively that meat tastes utterly foul.

Same phrase, other counties