On the spur of the moment means decided suddenly, with no planning at all. Booked on the spur of the moment.
A spur is what makes a horse move at once, which is where on the spur of the moment comes from. Decisions taken on the spur of the moment are remembered better than careful ones.
1phraseon the spur of the momentDecided suddenly, with no planning at all.
“They got married on the spur of the moment in a registry office.”
on the spur of the moment is a phrase.
Practised in Idioms