The Rice University Neologisms Database

12:00 pm of the following day. This is a strange word, I have only seen it in writing twice and heard it once. I suppose this word was created because things are usually happening at noon, and people want to tell others what is going on with them in the future. So instead of saying "I have something tomorrow at noon," they somehow decided to blend the noon with 'day,' maybe because of the sound similiarity with days of the week such as sunday and monday. This word is so rare to find that I imagine it can't be common usage yet, simply because theh meaning isn't clear from the outset. You have to rely on context, or maybe even asking the person what they meant (like I did), before the meaning truly becomes clear. It seems to be used by the younger, teenage generation, and it is unlikely that it will spread beyond that. Teenagers are always looking for ways to be trendy, and new words give them that opportunity. This word will probably die out before it gets very far at all, but who knows, we may wake up tomorrow and hear that the president is giving a speech noonday.