From Longman Dictionary of Contemporary Englishspur-of-the-momentˌspur-of-the-ˈmoment adjective [only before noun] SUDDENLYa spur-of-the-moment decision or action is made or done suddenly without planning SYN spontaneous
Examples from the Corpus
spur-of-the-moment• Today its message seemed less equivocal, and the accompanying note no more than one of Cameron's spur-of-the-moment enthusiasms. 