Definition & Meaning of "mad with it"in English

What does "mad with it" 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 losing control or behaving wildly. People typically say "He was mad with it last night" or "After three bottles, she was absolutely mad with it." The term originated in late 20th or early 21st century Scottish slang, particularly in drinking and party culture, and remains common in informal speech.