Something that has been thought up by fans of a certain type of media to either allow themselves to relate to a character or simply just for fun.
by arddulliau October 26, 2022

Something that was supposed to be fun and light but is tainted with weird Gen z that need to make everything about sexuality and gender
Weird Gen z: My headcanon is that this character from this story is an aro/ace-homosexual nonbinary
Others: oh.. I don't really care about that. I just wanna watch the show
Weird Gen z: oh so you're a arophobic, homophobic and transphobic
Others: oh.. I don't really care about that. I just wanna watch the show
Weird Gen z: oh so you're a arophobic, homophobic and transphobic
by robynngaeblack October 18, 2021

Definitely in no way related to Hetalia, it refers to what a character from the webcomic Homestuck sounds like in their heads
by AeromanDVance December 23, 2011

Used by many Hetalia fags to describe something that hasn't yet happened in original canon but has happened in their head.
i.e. Their own personal canon.
i.e. Their own personal canon.
by shounenrobo April 8, 2010

by jk_unicorn May 7, 2019

A Headcanon is something that happened besides the cartoon, not exactly in the cartoon
Canon is a history that we learn about in a cartoon (Like probably Luna x Sam, in The Loud House) in the main cartoon, not in a reboot or spin-off, a head canon is a connection to the history
Is possible that if a cartoon have a headcanon, it gets on a episode of itelf (like Stan Pines liked ms susan, in a episode they reveal what happened in their "date")
So, a Headcanon is a head of the cartoon (because maybe is going to be revealed soon) that answer a BIG question but is also a Canon
Canon is a history that we learn about in a cartoon (Like probably Luna x Sam, in The Loud House) in the main cartoon, not in a reboot or spin-off, a head canon is a connection to the history
Is possible that if a cartoon have a headcanon, it gets on a episode of itelf (like Stan Pines liked ms susan, in a episode they reveal what happened in their "date")
So, a Headcanon is a head of the cartoon (because maybe is going to be revealed soon) that answer a BIG question but is also a Canon
Well, Marceline and Princess Jujube was a couple in a headcanon, confirmed by someone who worked on the cartoon that is from Nickelodeon and was adopted by Cartoon Network
by #PãoÉMuitoBom March 18, 2019

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.
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
