Off the cuff

From Fresh Dictionary

English

Prepositional phrase

off the cuff, off-the-cuff

1. ((idiomatic{{#if:|, {{{2}}}{{#if:|, {{{3}}}{{#if:|, {{{4}}}{{#if:|, {{{5}}}{{#if:|, {{{6}}}{{#if:|, {{{7}}}{{#if:|, {{{8}}}{{#if:|, {{{9}}}}}}}}}}}}}}}}}}})) extemporaneous; without prior preparation; impromptu

   He made a few off-the-cuff remarks before launching into his regular speech.