When a person has taken the moral high-ground or are just up themselves, they are being "Holier-than-thou". Holier-than-thou literally means, holier than me or better than me.

When an asshole takes up a holier-than-thou position in a given situation simply because they feel it would be a good "asshole-move" to make.

When an asshole takes up a holier-than-thou position in a given situation simply because they feel it would be a good "asshole-move" to make.

acting like one is superior to others, condescending

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.

A sarcastic phrase used to designate a snobbish attitude, or describe people who take themselves too seriously. A play on "'holier than thou." Someone with a "more gothic than thou" attitude will likely tell you about the gothic bands they are into by saying, "You probably haven't heard of them."

Refers to someone that is stuck-up, or a snob. They must ALWAYS be the leader, and they are always a good leader. Ironically, they always have numerous faults, but never EVER admit to them.