A story written by a fan of a television show/movie/book/etc., featuring characters from it.

An abreviation of fanfiction. It can also be shortened to 'fic'. It is commonly found around fangirls or fansites.

Fanfics are fictional stories written about pre-existing books/films/animes/mangas/etc by fans of this work. A Disclaimer is included as standard, stating in some way or another that they do not own the characters they are writing about.

Some authors (e.g. J.K. Rowling) have encouraged fanfics on the grounds that publishing is not attempted (this will always result in a law suit, something the authors of fanfics have generally accepted). However, other authors (e.g. Anne Rice) have requested that fanfics based around their stories(etc) are not posted on fanfiction sites. These such authors are more commonly known as Kill Joys (see bitching).

Joey x Cold

After hearing the explosion in the forest, Joey and Cold instantly moved to the scene. Knowing Spec and Enel, their friends, were at the forest in the first place, they moved out of sheer necessity to the forest. Although, on their way, they managed to get into a sticky spot.

While dashing through the forest, suddenly they bumped into each other. Both came crashing to the ground, with Joey falling on top of Cold. Joey's breath hitched as he realized what was happening.

"Yikes, I didn't mean to fall on top of her, but... No! I can't think thoughts like those when our friends could have been reduced to ash in the explosion! But even so...it's hard to resist not caressing her face." Joey says, disappointed in himself and the situation simultaneously.

Like always, Cold was feeling the exact same way.

"Wow, in a situation like this with Joey it would be simple for things to take a weird turn. But, Spec and Enel need us right now. Joey's cute face and 6-pack abs can wait for right now. Later though..."

They were lost in their own thoughts when the second explosion happened. It brought them out and they started rushing back through the forest. Though, neither of them could lie if they said they weren't thinking of the other the whole way through.

Will Joey and Cold find Spec and Enel in the ensuing chaos? Or are they too late entirely? Find out in the next chapter of CC adventures: Dark Blue Sky.

fictional stories written by a fan of someone from a book/movie/band/etc.

A fanfic is another way to say fanfiction. Fanfiction is a fanmade story using characters/plot/places from other things (Books, TV shows, anime, video games, etc.). Some fanfics are decent, others are good, and most totally rape the living shit out of the original author's work.
Many people love fanfiction. Others hate the thought of it.

Fan Fictions. stories about the characters from a popular show/book/comic etc, written by fans.

Internet Stories or "Fan-Created works of Fiction" that are posted all up over the internet and usually done by Hardcore Fans on TV Shows before or after they get pulled off the airwaves.

Short for fan fiction, is not a plural. Usually based on books, brands, movies ect.

Often times, fanfic is a bunch of crap and takes away from the story's real plot. However, there are a few good pieces out there that don't stab and kill the real thing

Many authors allow fanfic to be posted without consent, as long as it mentions that the characters were created by them. However, other authors (AKA killjoys) are idiots and don't see the free promoting of the book, and don't alllow fanfic at all.

Fanfics are my life.

Fanfics are online books based off fandoms and are usually quality works of art
They must be treasured.