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Phrase used to describe the incestual fan pairing of Simon and River Tam; both characters from Firely, a short lived sci-fi series, and Serenity, the movie sequel. River is Simon's 17 year old little sister, who became mentally and emotionally unstable after the government experimented on her for three years. Simon, a gifted young doctor, gave up his entire fortune and future to rescue his sister, tearing apart his family as a result. They both became goverment fugitives after River's rescue. There are debates as to whether hints of the pairing ever showed up in the show or not. As a decision as whether or ot Tamcest exists is up to you.
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