Old Smith was awfully bucked because he'd taken four wickets. I should think he'd go off his nut if he took eight ever.1909, P. G. Wodehouse, chapter 17, in Mike: A Public School Story:
"[I]f I was to spring this news in Mr. Wright's hearin', why, such a sensitive, high-tempered gentleman as he would go plumb off his nut."1914, Zane Grey, chapter 13, in The Rustlers of Pecos County:
1 more example
"Look at them rapids ahead of us! Why, the guy that laid out this river was off his nut!"1918, Rex Ellingwood Beach, chapter 11, in The Winds of Chance: