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1.
Named for Joss Whedon, creator of Buffy the Vampire Slayer and Angel. Generally used by fanfiction writers when the shows chose to go in a direction that contradicted the story the fanfiction writer was currently working on. Jossing can mean that the show's writers contradicted earlier episodes, but more often just means that they filled in backstory differently than some fans did.
"I just wrote a story about Spike's past as a pickpocket, but it turns out he was a wimpy poet when he was human! I've been Jossed!"
by sarah90 May 25, 2005
 
2.
A term initially from Buffy The Vampire Slayer Fanfiction, the term 'Jossed' is now used in many fandoms as a description of when a fanfiction writer's explanation of a certain event or exploration of a characters' motivations which previously is ambiguous, is then explained by the actual fandom, and contradicts the fanfiction writers story.

The term is derived from the creator of Buffy the Vampire Slayer, Joss Whedon. The term is most prevalent in the science fiction genre.

It is used most commonly when authors are led to believe that a certain event may happen later in a Television series or book and write a story with that event in it, then the official author goes in a different direction, making their story 'AU', Alternate Universe.
This story about Buffy living in Los Angeles got Jossed when Buffy returned to Sunnydale. Now it's AU.

by Chanel #5 January 13, 2007
 
3.
When a character or his/her close relation is unnecessarily maimed or killed. This includes, but is not limited to the stylings of Joss Whedon (see Fred Weasley).
Person 1: Dude, On a scale of Spike to Tara, how bad was Wesley jossed?
Person 2: More than Coulson, less than Connor.
by mael March 30, 2013
 
4.
To be Jossed is to be caught off guard by a main character's death. Named for Joss Whedon, who likes to do it frequently and suddenly.
Veronica Mars kind of Jossed me with Lynne Echolls' death.
by Fainne March 09, 2011
 
5.
What happens when a passive-aggressive writer feels compelled to recreate his childhood bullying. Starts out by giving his audience lots of love, encourages them to believe things will turn out well, then backhands them at the end--and they inexplicably come crawling back for more.
If you watched Act III of Dr. Horrible's Sing-Along Blog, you probably got Jossed.
by tomte July 22, 2008
 
6.
to have accepted canon in a show or book or real life changed to siut facts that are currently convienient to the author.

Name comes from Buffy/Angel fanficiton due to the fact that the shows' creator Joss Whedon constantly did this, causing considerable irritation to fans and fanficcers worldwide.
Buffy the Vampire Slayer, S2, Spike clearly names Angel as his Sire, with the words "you were my Yoda,man!"

Come season 3 or 4 this is changed to Drusilla being his sire.
by Heather April 23, 2004
 
7.
To be stoned from smoking Marijuana. Derived from Joss Stone.
Hey man, are you Jossed right now?

Wow, I am really Jossed right now.

Lets get Jossed tonight.
by Zachary Louten March 10, 2008