Top Definition
Hitachiincest is a term used when reffering to the homosexual act/relationship between Hikaru and Kaoru Hitachiin from the manga turned anime Ouran High School Host Club or Ouran Koukou Host Club by Bisco Hatori.
Hitachiincest is a hell of a sexy sight to behold.
by Ryoga-chan July 02, 2006

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