An old, boring, no humor, crabby, no imagination, anal-retentive person.

The phenomenon of having to come out as bisexual to the same person/people repeatedly because they assumed or hoped that your sexuality was a "phase." Refers less to the holiday and more to the 1993 Bill Murray comedy film in which the main character experiences the same day over and over.

A person, usually older, who is unwilling to accept up-to-date customs or value judgements particularly in areas of entertainment and leasure.

normally old person who is old-fashioned

Old fashioned and really out of touch person.

A great example is the famous host of the popular late night radio show Coast to Coast am and lover of scorching hot pizza rolls, George Noory
Usually people like this have old out of date ideas and are extreme prudes that are scared of nudes.

an adjective used to describe a person that is being a downer, lame, boring.

Any person who would actually use the word "fuddy duddy" in a sentence.