A creative way for fans of a specific work of fiction to actively shit all over a writer's hard work.
Typically characterized by bad grammar and worse writing, fanfiction strives to undermine the careful development of popular characters by having them act in character-breaking ways.
The goal of writing fanfiction is often to find popularity among fellow unpublishable writers and fans of a common work of fiction.
"In my spare time I enjoy writing LOTR fanfiction that goes wholly against the characters and world Tolkien strived to create. I am the cancer of the creative writing world."