Today is Thursday, so the Irish word of the day is an Déardaoin. It is pronounced: an dayorDEAN in some provinces, in others it is pronounced un JearDEAN.
A word commonly used with Thursday is thirsty, and the Irish, being characterized as a thirsty people, would probably have a phrase similar to that… you’d think… right? Well, they don’t as far as I could tell. I found the word for thirsty which is tart, pronounced, oddly enough, tart. So – if you’re gonna say Thirsty Thursday in an Irish bar, you could say “tart jearDEAN!”