Is it “impulsive spending” or “impulse spending “? 1.Which one is more common? 2.Can we use “impulse spend” as a verb like “I don’t want to impulse-spend”?

I've heard "impulse buy" as both a noun and a verb. You can spend or purchase things impulsively.

1. Generally ‘impulse buying’ is more common at least from my UK standpoint; but out of those two perhaps ‘impulse spending’ is more common. I’d say ‘impulsive spending/buying’ is more grammatically correct but I don’t think said as much. 2. Perhaps the same for this, ‘I don’t want to impulse-buy’. Again this is from what I’ve heard in the UK. If you were to make complete grammatical sense you’d probably say ‘I don’t want to buy/spend impulsively’. But if you were to say ‘impulse spend’ in any case it would mean basically the same thing as ‘impulse buy’ 🙂

1. Impulsive spending is more common and technically correct. But that is because if it is used as a verb it is typically "impulse buy" 2. Yes, people will understand it. But "Impulse buy" is the common phrase. For example "She had no money in the bank largely because she could not curb her impulsive spending." "She removed her banking information from her phone. She didn't want to impulse buy anything." But really any variation of spend/buy will be understood and could be used correctly.

They are both correct. When and how you would use them is a matter of nuance or rather, preference. To answer your question you can say impulse spend but really you would say I don't want to spend impulsively. Using an adverb with spend is better. Impulse-spend isn't really a turn of language that native speakers use. Both Impulsive & Impulse are adjectives, in this case, modifying the gerund "spending". A gerund is a verb used as a noun.

I've never heard these ones can someone please explain. What are their meanings, And the correct answer?

"Impulse spend" is like a single unit. "Impulse-spend". Linguistically it's a compound word. "Impulsive spending" is more separated, an adjective and a verb. "Impulse-spend" will only change at the end, "I don't want to impulse-spend" or "I did some Impulse-spending" or the like, while "impulsive spending" will conjugate fully, "I don't want to impulsively spend" or "I did some impulsive spending" etc.. They also technically carry a different meaning, since "impulse-spending" (or probably more commonly "impulse-buying") refers to the established concept of making impulsive purchases while "impulsive spending" is manually describing spending that is impulsive... but it doesn't really matter in this case since the established meaning of "impulse-spending" is the same as what "impulsive spending" describes.