off-the-cuff

American  

[awf-thuh-kuhf, of-] / ˈɔf ðəˈkʌf, ˈɒf- /

adjective

1. with little or no preparation; extemporaneous; impromptu.

   a speaker with a good off-the-cuff delivery.

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off the cuff Idioms  

1. Impromptu, extemporaneous, as in His speech was entirely off the cuff. This term supposedly alludes to the practice of speakers making last-minute notes on the cuff of a shirtsleeve. [1930s]

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Etymology

Origin of off-the-cuff

First recorded in 1940–45