Pachelbel Canon 

Every cellist's worst nightmare.

Conductor: We're playing Pachelbel Canon for the next concert.

Celli: OH GOD NO

Pachelbel Canon by OperatorRamirez February 9, 2019

Head canon 

An interpretation of a piece of media that is not shown or confirmed in the original but is believed to be true simply for preference.
May also include direct deviations from the canon.

In a perfect world, instead of Philip, Grog would have recited Percy's full name perfectly as his 'fancy name' and, after a moment of stunned silence, Percy would have added, 'You can just call him Percy.'"

...This is my new head canon.

Head canon by Haomakk April 7, 2021

canonical 

The real deal; a piece that is widely recognized as a genuine member of the body of work (oeuvre) of a given artist/writer/composer; a standard by which all others are compared.

I just finished reading the "canonical list of auto plurals" on manofleisure.us

canonical by khiddy June 2, 2004

Canon event 

Event: Someone must get folded, for Spiderman to be molded

Do not break the canon event, Miles! - Miguel O'Hara

Canon event by Andester June 18, 2023

canon-rape 

A word made from canon, meaning original, and the word rape, meaning unwanted force/crime. This term is used when a fan fiction author tries to reconstruct an original work to their liking. This often times makes the author look like a complete nut who has no appreciation for the original creator or storyline. Usually this involves the aid of a mary-sue or gary-stu of some sort. The results normally are irritated readers and scared audiences.

Jesus, since when is Naruto placed in modern times? I mean cars? Seriously. And how can Itachi be roommates with Sakura? It makes no sense! This author has canon-raped Naruto!

canon-rape by PMSing English Teacher April 30, 2007

canon camera 

A super expensive camera that is used to take professional style photos, white girls use them to take mirror pics showing off their ass

Mom: what are you asking for, for Christmas?

White girl: a canon camera!

Mom: for what

White girl: ... Selfies..

canon camera by Twerk goddess January 5, 2014

Canon Robins 

has the most voluptuous bandonkadonk, and a behemoth of a …..

What a lad Canon Robins is.

Canon Robins by siuuuuu October 7, 2021