You are right about the meaning of 'trick or treat'!!
1 and 2 mean the same thing, yes.
1. I'm so happy with my job.
2. I'm so satisfied with my job.
(Are both the same in meaning?)
3. We dress up and shout "Trick or Treat!"
(What does "Trick or Treat" mean?)
* If you don't treat me, I will play a trick on you. <= Is it the meaning of that?
2 answers
no