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When someone posts their own view or belief of something they think happened in a piece of fiction as a fact or truth when it hasn't been stated or addressed as such by the work itself or the creators of said fiction. Usually used to try to fix plotholes in a story.
Bill: This water has healing properties because in Book 3 , they gave some to Saragal and it healed her.

James: It does? But the book never says anything about that spring having healing powers and the characters who drank from it before never had their injuries healed.

Bill: Well it makes sense, so its true!

James: Bill, you can't just use your own headcanon solution as a way to explain something that has no evidence for.
by JazzRobot August 13, 2017
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