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

by jk_unicorn May 7, 2019

Used by followers of various media of entertainment, such as television shows, movies, books, etc. to note a particular belief which has not been used in the universe of whatever program or story they follow, but seems to make sense to that particular individual, and as such is adopted as a sort of "personal canon". Headcanon may be upgraded to canon if it is incorporated into the program or story's universe.
In my headcanon, John and Mary bicker like siblings when they're around each other... They just seem like they're brother and sister to me!
by the-deudliest-firearm July 17, 2012

A HeadCanon is something that did not happen Canonically or Factually in an event(story, reality, etc.) but is something you would've liked to happen.
"I ship Name with Name. I think I would've liked if Event happened instead of Event."
"What? That's weird. Why do you think like that?"
"Oml, don't be a B¡tch. It's just a HeadCanon."
"What? That's weird. Why do you think like that?"
"Oml, don't be a B¡tch. It's just a HeadCanon."
by Label_The_Candle August 21, 2021

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

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
