Yes, it is a real word and it means a morbid, irrational fear of Friday the 13th.

That is one big word!

Please don't let this one be in the spelling bee . . .

And here's a little something from About.com

13: The Devil's Dozen
It is said: If 13 people sit down to dinner together, all will die within the year. The Turks so disliked the number 13 that it was practically expunged from their vocabulary (Brewer, 1894). Many cities do not have a 13th Street or a 13th Avenue. Many buildings don't have a 13th floor. If you have 13 letters in your name, you will have the devil's luck (Jack the Ripper, Charles Manson, Jeffrey Dahmer, Theodore Bundy and Albert De Salvo all have 13 letters in their names). There are 13 witches in a coven.

Interesting, eh?

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Yes, it is going to kill me! I have calculated the time, and two seconds is a hazard to my f*@#ing health.