A Sugar Plum Fairy is a person who gets so high on the abuseable substance of their choice that they begin passing out freebies to everyone around them in the hopes of making them feel the same. Generally applied to people on LSD or Ecstacy.
Jessica: "Dude, take this hit! You gotta see what I'm seeing!"
A straight, Christian man, anywhere from 20 to 50, that behaves normally from January through November. However, as Christmas gets closer, he gets so wrapped up in the holiday spirit he becomes increasingly effeminate, reaching maximum queer-ness the week of Christmas. At that point he's only a few egg nogs away from grabbing the karaoke mic and singing Elton John and Wham! all night long. But after Christmas has passed, he will deny any and all of his behavior for the past month or so, and build a thick macho facade to last through February, or until his friends stop teasing him.
"Dude, these two songs sound similar yet different at the same time"
"That's an in the hall of the mountain king-dance of the sugar plum Fairy situation