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all knowledge is contained in fandom
The notion that members of a given fandom tend to bring up or discuss all sorts of irrelevant topics. Originally the phrase was "all knowledge is contained in fanzines," a term for magazines made by or for fans of something. Usually used as the acronym "AKICIF." This is supposed to be a forum for fans of "The Expanse," but everyone has somehow gotten sidetracked into a conversation about religious ideologies. All knowledge is contained in fandom, I guess.
slang Someone who is fully aware of their extreme interest or excessive investment in fandoms. Despite the negative connotations of "trash," this term is typically a proud or self-deprecating identifier, in the manner of a reclaimed term. In case you forgot that I'm fandom trash, here, have some of my "Supernatural" slashfiction!