Dictionary
spur-of-the-mo•ment
Pronunciation: (spûr'uv-&thslash;u-mō'munt), [key]—
adj.
occurring or done without advance preparation or deliberation; extemporaneous; unplanned:
a spur-of-the-moment decision. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.