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.
The re-occurrence of a holiday, regardless of similar date to previous years, that holds a special meaning to a person because one of the previous celebrations of this holiday involved a major event (i.e. first date, starting a friendship, losing virginity, moving); if the holiday moves, than the "holiversary" moves too
"Dude I'm jewish and don't have any plans for easter, wanna hang out?"
"sorry man, me and my girlfriend are celebrating our holiversary since we met volunteering at a neighborhood easter-egg hunt last year."
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.