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MST Mystery Science TheaterMST is a TV show that humorously ridicules 'bad' SF, usually monster/alien invasion schlock from the '50s. In fanfiction, an MST is a story that is purposely written as badfic/suckfic, with comedic asides from fictional 'critics' inserted at various points. An MST is a parody. OTOH, there are people who enjoy pirating serious badfics off their home sites, giving them the 'MST Treatment' and then reposting them with the asides inserted. They're usually pretty funny...unless you're the original author. See 'Sillyfic', 'Fluff'.

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