Northern Irish. A condition of extreme inebriation brought about by taking in copious volumes of drugs and/or alcohol. Typified by sitting in the corner drooling, and while essentially conscious, certainly incapable of any kind of meaningful human interaction.
"What about Doherty over there, is he alright?"
"Aye, he had 2 bottles of White Lightning and half a bag of shrooms earlier. He's just circling the airport."