If i may interpirt this dream, I think it a very literall dream, It probably means that your going to want a group of three rodents (Maybe rats, or mice, or even guinea pigs) that are in bad conditions, And someone close to you (i.e. your mother, etc...) is initially going to be against bring them in, but they will warm up to the idea. and the popcorn can mean that they will be happy with you.
Aww! I've had rats for years but they've all died.. My family says no more rats because it's emotionally exhausting when they died, which is often due to their short lifespan. I'd like to adopt mice, they seem like so much fun. I also want to adopt another piggie.. And I ate popcorn a few weeks ago while I was volunteering at the humane society.