Cat

n.

Heard in Wicklow, Armagh, Donegal, Waterford, Antrim, Wexford, Tipperary, Cork and Dublin

Unpleasant, useless or of poor quality.

In use

The dinner looked and smelled lovely but tasted cat.

Posh English

The dinner appeared and smelled quite magnificent, yet it tasted perfectly dreadful.

Same phrase, other counties