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Blend of twin +‎ incest or twin +‎ -cest.


  • IPA(key): /ˈtwɪnsɛst/
  • (file)


twincest (uncountable)

  1. (chiefly fandom slang) incestuous sexual relations between twins, or siblings who look very similar.
    • 1985, Joseph Hansen, A Smile in His Lifetime[1], New American Library, page 64:
      This one's about gay brothers. I'm calling it Twincest. Nice, no?
    • 1998, Film Review: Special: Year Book 1997/98[2], Visual Imagination Ltd., page 117:
      As 'twincest' is in (a trend started by Parker Posey and Josh Hamilton in The House of Yes, to be released in the UK in 1998)...
    • 2007, Rachel Kramer Bussel, Best Sex Writing 2008:
      These pieces you might very well be able to relate to even if you've never been horny for twincest, had an affair, or been a black man...
    • 2013, John Lancaster, “When did you get hooked?”, in London Review of Books, volume 35, number 7:
      In the course of one of his climbs, he hears adult voices through a high window, goes to investigate, and comes across Jaime and Cersei energetically engaged in (to use a neologism popular with fans) twincest.