spur of the moment vs spur-of-the-moment

Some examples from the web:

• I just came on the spur of the moment.
• And spur of the moment, since they only just found the sword and heart stone.
• Not so spur of the moment.
• Kind of spur of the moment.
• It was just a spur of the moment kind of thing.
• But many more were carried out on the spur of the moment by smaller numbers.
• This smells spur of the moment to me.
• It was a spur of the moment thing.
• It was either accidental or spur of the moment, But the second kill, he only needed one shot.
• One little spur of the moment lie and I'm in a situation.
• Henry III had a reputation of ruling by fiat - making royal proclamations on the spur of the moment.
• Say, Monroe, you do throw the greatest parties, but this one seemed sort of spur of the moment.
• My Twitter messages, if you have noticed, are all very spur of the moment... a year ago I probably would have edited them or not said something that could have been misconstrued.
• In this case, the shape is drawn on the piece of briar following the wood features and the artisan's spur of the moment.
• Circumstance, spur of the moment.
• This smells spur of the moment to me.
• It was spur of the moment.
• This was not a spur of the moment decision.
• The decision to stay over was spur of the moment.
• It was spur of the moment.

Some examples from the web:

• occurring or developing without premeditation : hastily extemporized <a spur–of– the–moment decision>. See spur–of–the–moment defined for ...
• Spur of the moment means to do something on impulse, without any forward planning. This could be due to fear, or as such, another emotion. The majority of ...
• 3 days ago ... Definition of “on the spur of the moment” - English Dictionary ... ​planned to go away - it was one of those spur-of-the-moment ​decisions.
• Also found in: Dictionary, Thesaurus, Medical, Legal, Acronyms, Encyclopedia, Wikipedia. Related to on the spur of the moment: thick and fast, pillar to post ...