ANSWER:
Compulsive means when you take actions or decisions on the spot or in the moment without thinking it through.
For example, compulsive shopping is when an individual purchases goods and / or services in the moment without properly thinking it through. They may come to regret it later after realising that they had shopped compulsively.
I have also attached a screenshot of the definitions for 'compulsive' as stated by Google, if you don't understand the definition I gave or want more information.
Hope this helps! <3