42
You don't say.
Have you even read Hitchhiker's?
Read hitchhikers?Is that like a book or do you mean actual ones?
...Do you live under a rock with internet access?The Hitchhiker's Guide to the Galaxy. Thats what he is talking about. Its like one of the best book series ever.
It's OK if you read the book but don't throw the 42 thing around like it's the new Gangnam Style. It's already crossing into the "overused meme" area.