irish goodnight
When the host of a party starts screaming and throwing all the coats at the guests to get them to leave. Coined by Tina Fey in _Bossypants_, it should not be confused with an irish goodbye.
Yet another sound of breaking glass led my wife to immediately break up the party with an irish goodnight.
irish goodnight
When the person you've been texting with all night just goes to bed, unannounced. Usually because they've been drinking.
Janice had 6 40s while we were texting last night, and then just went silent and gave me the ole Irish Goodnight