Twincest
//ˈtwɪnsɛst//
"Twincest" in a Sentence (4 examples)
This one's about gay brothers. I'm calling it Twincest. Nice, no?
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)...
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...
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.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.