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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!
(also written as "head canon," but it's really one word.)

An idea, belief, or aspect of a story that is not mentioned in the media itself, but is accepted by either the media consumer themselves or the fandom in general. If it is confirmed by the creator of the story, it becomes canon.
In Homestuck , a popular webcomic , many suspect the headcanon that the trolls are carnivores, because of their natural homicidal tendencies and sharp teeth. It's never explicitly stated in the comic that this is true, but it'd be kind of dumb to assume they're a race known for salads and ice cream sundaes.
Headcanon by TickTockTimeTraveler October 12, 2014
Word of the Day on September 15, 2019
Now... reality can be whatever I want...
-Thanos
person 1: omg i headcanon todoroki and dek-
person 2: please stfu
Headcanon by ._.daydreaming April 11, 2022
The non-canon personal ideas, opinions and believes that certain person or group of people feels strongly attached to, about a certain work of fiction (book, movie, cartoon, anime series, manga, comic book, etc...)

Sometimes people put their own headcanons above the actual canon of what was actually shown.
Person A: Android 17 is barely SSJ3 level, and that is exaggerating! Goku in SSJ Blue could have defeated 17 with a single punch!

Person B: That is your Headcanon. If he is a SSJ3 level character, then why Goku fought 17 with SSJ Blue instead of SSJ3, like he did with Trunks in a previous arck? Also, how can a SSJ3 level character resist attacks capable of hurting SSJ Blue evolution Vegeta and SSJ Blue kaioken x20 Goku that are 20 times more powerful than a SSJ Blue, 17 received a kick from Jiren, meant for Vegeta Blue Evolution in episode 127, and also took an explotion from Jiren that was able to knock out Goku and Vegeta, and he was still able to fight, a SSJ3 level character shouldn't be able to do that!
Headcanon by TruthTellerX01 July 10, 2019
Headcanons are traits, events and actions a fictional character is give to add more persona. Used by followers of various media of entertainment, such as television shows, movies, books, etc. Headcanons aren't specific .They are mostly add-ons to a profile of a character from someones belief, mainly never or possibly hinted by the creator.
Headcanon : Ichigo holds orihime with one of his arms while she lays on his chest as they sleep.
Headcanon by Bluuu1999 December 31, 2015
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."
HeadCanon by Label_The_Candle August 21, 2021
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Me: Poggers!
Poggers by Just_Charles April 14, 2020
Word of the Day on October 26, 2026

Oblication 

A vacation, feeling more like an obligation, that involves visiting or staying with family.
So Joe where are you taking the kids for spring break vacation? We are going on an oblication to Boca to visit my mother-in-law.
Oblication by kimmerr May 5, 2011
Word of the Day on October 25, 2026

Surf Dracula Syndrome 

A phenomenon in film/television series, most notably streaming series, where the main premise is drawn out to such a point that it takes an entire season or more to get the parts of the series the audience is actually interested in seeing.

For example, if a series is titled "Surf Dracula," a majority of viewers would tune in expecting to see Dracula surfing by the first or second episode. However, the entire first season would instead be tedious padding and backstory before finally ending with Dracula surfing in the last five minutes of the season finale.
I watched "Smallville" on Netflix the other day. Dude, it was ten seasons of filler before he finally flew! Major Surf Dracula Syndrome!
Word of the Day on October 24, 2026

Northstarring

Finding your way back to the truth by fixing on one verified fact and working out from there, the way you navigate by the North Star when everything around you is spinning.
Rumours were flying everywhere, so she went northstarring — one checked fact at a time.
Northstarring by Light Bearer October 22, 2026
Word of the Day on October 23, 2026

Plate of Brown 

A plate of brown consists of foods that have little to no nutritional value, and are typically deep fried. A true plate of brown will also be accompanied by a dark soda.
Wanna go to meal hall & grab a plate of brown?
Plate of Brown by Cheddar Craigson September 18, 2020
Word of the Day on October 22, 2026

Larpenomics

When finance content creators rent out fancy cars and flex cash to seem richer than they really are in order to promote and sell their “get rich quick” courses.
Andrew Tate has mastered the field of larpenomics
Larpenomics by Rbois09 October 21, 2026
Word of the Day on October 21, 2026
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