A word used by those who write fanfiction. It refers to a idea, storyline, or pairing ect. that was not promoted in the originalwork the fanfiction was based on. Antonym of canon.
The fanfiction's plot was so non-canon that readers could hardly make a connection between it and the original work.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi