Top Definition
A combination of 'Hyuuga' and 'incest'; used to describe the couple pairing of the anime/manga NARUTO characters Neji and Hinata, who, in the story, are cousins. Applies to fanfictions, doujinshi, art, etc.
"She was extremely fond of Hyuugacest."
by Allipearl June 04, 2007

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