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by rvbissell 534 days ago
'headcanon' is jargon within general fandom. The term refers to the application of imagination against the established canon of a body of fiction, to expand upon that body of work.

Example:

- Superman being from Krypton is canon.

- Superman not truly being the son of Jor-El, because his mom slept around, might be one fan's headcanon.