Throwing a party or celebrating an event before it is appropriate. Most often done in an effort to fit the schedule of someone other than the party honoree.
Kelly: Why are we having cake today? Isn't Cara's birthday next Friday?
Mark: Yeah, but her boss is on vacation next week, so we're having a premature celebration.
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The act of bingeing on food right before you go on a major diet, in an effort to eat all of your favorite junk food before swearing off of it for a while.
Kelly: "Um, are you really going to eat that entire bag of Doritos? And what happenend to the box of Krispie Kremes I just bought?"
Mark: "Sorry, I start the South Beach diet tomorrow- just doing a little last suppering."