Neologism 15: Self-coinage

I'm sure that we all have friends that have, at some point, been guilty of self-coinage. This word means, "To coin an already existing word that you didn't know about." I can remember times when people would actually get annoyed when people told them that "their" word ad been around for years. They were especially annoyed wen the word that they had created had a "real" meaning that was different from the one that they had created.