Noun
throuple (plural throuples)
(informal) Three partners in a romantic or sexual relationship; a ménage à trois.
Real-life throuple Derrick Barry, discuss their relationship and discover how much they really know about each other (while winning some cash) on “Throuples for Cash.” Source: Internet
She and Marcus go up to Massachusetts and pull William off that lobster boat, and the throuple is back on. Source: Internet