spur-of-the-moment

[ spur-uh v-th uh-moh-muh nt ]

/ ˈspɜr əv ðəˈmoʊ mənt /

occurring or done without advance preparation or deliberation; extemporaneous; unplanned: a spur-of-the-moment decision.

Origin of spur-of-the-moment

First recorded in 1800–10

Did you plan on this or is this a spur-of-the-moment kind of thing?

Explosion of Cute: Inside the Superfan Mania of Hello Kitty Con 2014 |Sarah Bay Williams |November 2, 2014 |DAILY BEAST
Have you ever done the impulse Vegas trip before, a spur-of-the-moment “screw this!”

Diablo Cody’s Personal (and Directorial) Paradise |Kevin Fallon |October 18, 2013 |DAILY BEAST
Spur-of-the-moment toasts can be an off-the-cuff pleasure if the mood is right and the message heartfelt.

Romney and Obama’s First Lunch: A Social Etiquette Guide |Kevin Fallon |November 28, 2012 |DAILY BEAST
It was actually a dare, kind of, a spur-of-the-moment thing.

Marine Dakota Meyer Steps Up to Help Veterans Find Success Back Home |Dakota Meyer |August 15, 2012 |DAILY BEAST

Having 40 minutes to kill before his next appointment, he made a spur-of-the-moment decision to stop by Napa State Hospital.

Claude Edward Foulk Gets 248 Years |Christine Pelisek |February 23, 2011 |DAILY BEAST
And, as a Free Trader, spur-of-the-moment action was a necessary way of life.

Plague Ship |Andre Norton
We must give these good people as much time as possible, considering it's a spur-of-the-moment affair.

Nobody |Louis Joseph Vance