The scene: My mother and I are at a BBQ place outside of Houston, Texas. A group of four people walk in: a woman about 35 years old, a young boy about 10 years old, and two teenage girls, perhaps 16 years old. They order their food and sit down behind us, waiting for it.
Someone says something about a threesome, I perk up. Some more (joking) babbling about a love triangle, between the boy and the two teenage girls.
Woman: It’s a menage-a-trois.
Girl 1: A what?
Woman: [Scoffing, surprised that the two girls don't know the phrase.] A menage-a-trois, it means threesome. It’s like a french word, or something…
Girl 1 & 2: Oh…
Strange conversation to have in a BBQ place.