From Longman Dictionary of Contemporary Englisharmchair traveller/fan etcarmchair traveller/fan etcEXPERIENCEDsomeone who talks or reads about being a traveller, or watches sport on television but does not have any real experience of doing it Her books about her adventures give enjoyment and inspiration to armchair travellers. Armchair fans will have to pay extra to watch the best games live. → armchair
Examples from the Corpus
armchair traveller/fan etc• The first figures hint that armchair fans aren't rushing out to buy dishes because of the new football contract.• The armchair traveller for whom you are shooting these pictures does not want to visualize paradise under cloud. 