off one's trolley

English

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Prepositional phrase

off one's trolley

1. (informal, humorous, idiomatic) Having gone mad; insane.
   • 1919, American Guild of Organists, American Organist, volume 2, page 409:

     The Romance is the best part of the four movements. One is a bit off one’s trolley at such times and I should surely write a better Suite at this time after twenty years of sober reflection.

   • 1915–1981: Kenneth Burke [contrib.], Malcolm Cowley [contrib.], and Paul Jay (editor), The Selected Correspondence of Kenneth Burke and Malcolm Cowley, 1915–1981, page 302 (1988; Viking; →ISBN, 9780670813360)

     On the whole, bodily symptoms have at least the consolatory fact about them, that they replace mental symptoms, fears of going off one’s trolley; and I suppose that, if I got rid of all the physical symptoms, things would but have been cleared away for a new worry about mental ones?

   • 2006, Mike Ollerton, Getting the Buggers to Add Up, Continuum International Publishing Group, →ISBN, page 164:

     Being slightly off one’s trolley
     Uppermost in my list of top four teaching behaviours is being ever-so-slightly crazy ... to keep students guessing whether or not I have lost my marbles, and being not quite so predictable.