Not canon; not official.
A theory and headcanon can be considered canon by an individual, however, not by the creator and therefore uncanon.
"Dude, it's just a theory, it's uncanon."
"Why is my ship uncanon?!"
by Starfondler February 12, 2018
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Another word for unbelievable.
It’s so bad that it’s unbelievable, uncanon
I hate cheese so much that it’s uncanon”
by Bluecv February 4, 2018
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Adjective

1) To be lacking in Nick Canon like qualities.

2) Boring, not entertaining.

3) Failing at attempted humor - severely.
“Nobody watches that weak ass show because it wasn’t phunny and it was completely uncanon.”
by Phuckin' Phylean February 6, 2018
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Something that describes another thing as not canon. More specifically, something that has absolutely never happened in the plot.
Person 1: "According to this fanart, this scene is canon."
Person 2: "We must not be watching the same show, this is uncanon and you're using fanart as a source.."
by Gerrant November 17, 2021
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