Dear Enriquezmodesta,
Aspirational clutter is when you buy things that you would want to use or make, but you become uninterested, too busy, etc. to do and/or use the things you bought. Also, you have a hard time letting go of the things you bought (so it becomes clutter) because you still have the thought that you might be able to use those things in the future.
Hope I helped! c:
~reige