Travel bug. In British English, the slang word "bug", in the above given context, means an illness or a disease which is usually infectious. I unique serial number attached to some sort of trinket used in Geocaching. It is transfered from cache to cache by users and recorded on spielcasinodeutschland.review. It means to become addicted to something, in this case travelling. You have an experience that triggers your interest in something that you were.