Crown Birthday
A birthday where one's age matches with the day of the month.
Mike: Hey, isn't your b'day coming up?
Stu: Yeah, it is.
Mike: Isn't it 16th of this month?
Stu: Yeah, also I'm turning 16. It's my crown birthday!
Stu: Yeah, it is.
Mike: Isn't it 16th of this month?
Stu: Yeah, also I'm turning 16. It's my crown birthday!