A person (or entity) who does what they have always done, whether or not it makes sense or is logical. A habitarian's favorite explanation is "because we've always done it that way." A habitarian does not only NOT think OUTSIDE the box--a habitarian does not think INSIDE the box, or anywhere else!
Friend: Why don't you pay your bills online--it's so much easier? Habitarian: That's the way I've always done it.
One who only eats happy meat. Often mistaken for a vegetarian, but these folks have no hard feelings about eating meat, as long as it's free-range, grass-fed, organic, happy meat.
A person who celebrates religious holidays (such as Christmas, Hanukkah, Easter, etc) despite a complete lack of religious beliefs.
Joe: "Hey I heard you're having people over for Hanukkah. I didn't know you were Jewish!"
Phil: "Oh we're not Jewish, we're doing it because we're holidarians."