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!"
Formerly great rock/metal band that suddenly started churning out disposable MTV pop rock dung aimed at 11-year-old girls and nobody else. To their credit, they fully admit to being sell-outs, but that doesn't make their musical sewage any more respectable or listenable.
I played my metalhead friends a song off Sugar Ray's first album and told them who it was, and they laughed at me and beat me half to death with shovels.
when you have an extreme sugar high. way beyond a sugar buzz, and in the morning you usually wake up with a sugar hangover and can't look at another sugary food, (candy) for three days without wanting to throw up.
bob: last night you had so much sugar, you were acting high.
lilly: i was having a sugar orgasm