What does canonical mean when used in sentence?

I just heard someone said "a canonical horrible idea"

I have been googling and still unable to understand exactly what "canonical" means when not used in programming language.

Can someone explain me what "canonical" actually means?

Solution 1:

canonical
adjective Also ca·non·ic.
1 pertaining to, established by, or conforming to a canon or canons.
2 included in the canon of the Bible.
3 authorized; recognized; accepted; canonical works.
https://www.dictionary.com/browse/canonical

In short - authoritative
So, "a canonical horrible idea" would be an authoritatively horrible idea.

At least, that feels like the intent