Definition & Meaning of "mortalled"in English

What does "mortalled" mean in Scottish slang?

It is used in Scotland, especially in Glasgow and the West of Scotland, to mean extremely drunk or intoxicated, often to the point of being unable to function. People typically say "He was mortalled after the wedding" or "We got absolutely mortalled last night." The term originated in 20th century Scottish slang, and remains common in informal speech, similar to "steamin'" or "mad with it."