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The Tolkien fandom definition of incest between the extremely hot characters of Thorin Oakenshield and/or his nephews, Kili and Fili. They are all in the royal line of 'Durin', hence the name 'Durincest'.
"Look at this fanart of Kili & Fili making out."
"Dude, that's Durincest."
by MarMighty April 20, 2013
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