It means you have 42 trophy points (see left). Hitchhiker is a reference to the Hitchhiker's Guide to the Galaxy (https://www.independent.co.uk/news/yes-the-answer-to-the-universe-really-is-42-1351201.html)
There's this on the wiki: https://empireminecraft.com/wiki/ranks-information/#forum-titles-ranks And there's this post by me. https://empireminecraft.com/threads/2018-changes-new-forum-trophies-and-titles.75169/#post-1401514
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