when someone watches a given TV show or movie well after its initial release and then expresses an opinion to people who saw it when it first came out
“Finally watched the last episode of The Sopranos on DVD. That ending sucked!”

“Yeah, but we got over it years ago. Now I’m all pissed off again. Thanks for the fanachronism.”
by Cabalist August 10, 2010
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An ardent following or liking for something, apparently at odds with ones geographical location or class. A portmanteau word made of fan and anachronism
The other lads on the estate considered Baz's love of Baroque Chamber Music something of a fanachronism
by Markiavelli February 17, 2013
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