A person who is headie or
heady or a head (ie into the jamband scene) and believes they are better than other fans because they have been to a large number of shows, tour extensively, know a great
deal of statistics by
heart, wear a lot of patchwork, or are extensively
organic--anything to do with the jamband scene. Essentially a jamband snob.
Just as “holier-than-thou,” is a word
one would use to describe someone who believes they are better than others for their moral points of view, the person who is “headier-than-thou” thinks s/he is better than other fans because of their level of “fan-ness,” or at least this is what other heads believe the “headier-than-thou” person is communicating through their behavior.