It means October 31st is your birthday.
What does it mean if you are born on Halloween?
It means all your birthday parties will be costume parties.
It just means you get a lot of candy for your birthday.
It means everybody will be too busy to come to your birthday parties, so you are required to have it a few days prior to your actual birthday. It also means your parties will all be costume parties.
It means you were born on October 31.
It MEANS . . . You can go "Trick-or-Treating" on your birthday . . It carries no dark nefarious meaning. ;)
It means that you can have a Halloween themed birthday party.
a holiday you can go trick or treating or have a costume party.