The first entry was probably written by someone who actually writes fanfiction.
1. Fiction written by fans about an extant fictional universe.
2. Amateur fiction of any kind published in fanzines.
He wrote a great piece of fan fiction set in the universe of Buffy: The Vampire Slayer.
She had a piece of fan fiction published in THE CRUDZINE QUARTERLY.
The second entry is actually very anti-fanfiction and homophobic in my opinion.
A very useful tool to make characters from TV shows, anime and video games gay.
Just recently, I made an Avatar fan fiction in which Fire Lord Ozai molests his son Zuko...then I made King of the Hill fan fiction that is involves Hank Hill and Khan Souphinosaphone engaging in a homosexual affair.
Not all fanfiction takes straight characters and pairs them with members of the same sex. Certain fandoms (or, if using the first definition, universes) contain gay couples. Also, most sites have guidelines that if scenes such as the Avatar one described above are even allowed, the rating much show this and warnings must be included.
The third definition, is by far the worse.
A piece of 'literature' written by a fan of a tv show, movie, series, anime, etc centered around the same or some of the same characters and possibly a similar plot. Fan fictions usually contain characters acting in a manner that they would never act like, dating people they would never date (including people not of their gender preference), getting with people that they would never get with, and so on. Many are never finished, are never editted, and are not worth reading. In sites such as fanfiction.net they are likely to contain yaio.
"(reads) ...And so Itachi pressed Naruto... (wait is this fan fiction rated R? -goes to read another-) ...Kiari commed her haire in perfekt emostile..."
Now, it is obvious where this person was reading, The Pit aka fanfiction.net. When I first started reading this, I thought it would be the best, until I got past the first sentence. I know for me personally, and a couple other fanfic writers that I speak with, keeping true to the character is a part of writing. I do not like this person's use of the word "usually." This generalizes all fanfiction and creates stereotypes. Yes, there are a lot of unfinished fiction, but most sites that archive good fanfiction have a majority of finished stories. Also, I like how ze says "are never editted" (notice the error that should have been EDITED). Another thing, yaio, is only used with fanfiction based on anime (as far as I know, please correct me if I am wrong). Now the thing that makes me the angriest, is near the end of the slew of generalizations. "are not worth reading." That's just bullshit. I have read many fanfictions that were well worth the time I spent reading them, and I feeling like at least some of my stories are worth the time as well.
Now that I have ranted about this, first I would like to include the link to these entries:
http://www.urbandictionary.com/define.php?term=fan+fiction
Please if you do only one thing when you see these, give the third entry a thumb down. Maybe, if it gets enough, it'll be removed from the site. Yes, I believe in freedom of speech, I am a journalism major and a fanfiction writer, but saying that, especially the journalism part, I believe that what is said should be TRUE and should NOT generalize.
Now, I would like to give you MY definition of Fanfiction.
Fanfiction is when a person, who is a fan of a particular show, movie, book, etc., wants to feel as though ze is part of the action, and writes a story. These stories could be long, uber fics, or short one shots or drabbles (100 words exactly). Fics can have plot or be PWP (porn without plot) or pointless little fluff pieces. Sometimes, these stories are used to "fix" a problem the fan saw in the show, such as bring two characters together (Xena and Gabrielle anyone?) or ignore the death of a character (Tara, Dana, Dumbledore). New fics from fandoms such as Xena, Buffy, Birds of Prey, continue even after the show has ended. Fanfiction is another way for fictional characters to live on forever in the hearts of the people who loved them.
If you disagree, or agree, or want to add anything to the above definition, please, leave comment.
Also, please, vote in the poll at the bottom of the page. Thanks!