1) Noun: A fictional entry in an on-line wikipedia.
2) Noun: A fake word thrown into a conversation, in order to make listeners think the speaker is plugged in to some new source of slang.
I added the word fiki to the urban dictionary. It's like totally ficticious, but really should be a word, because making up new words keeps language from getting lame. I once made up a series of words, each one defined by another new word, to make a loop (circular definition). So it was a fiki-wiki-loop.