Up the Déise
The Waterford rallying cry, roared at matches, weddings and funerals alike.
Up de Déise! Sure we'll bate dem in de replay.

Shall I translate it into posh English for you, horse?
Hello there, old sport. Here it is in posh English.
Hurrah for Waterford! We shall surely prevail in the replay.
Questions
What does up the Déise mean in Ireland?
The Waterford rallying cry, roared at matches, weddings and funerals alike.
How do you use up the Déise in a sentence?
“Up de Déise! Sure we'll bate dem in de replay.”
Updated
On the list: Irish slang phrases