Etymology From free + -some (adjective-forming suffix).
1
Characterised or marked by freedom.
And in a freesome spirit of fromage.1923, Clarence Colman, My Philippine Remembrances:
She was intrigued, suddenly. She said, "Anybody I know?" "My wife," he said. "And another." "Oh my God!" she said. That's too amazing. A freesome threesome. Isn't that the Seventies in New York all over for you.2016, BJ Reluctant, The Whoring Lesbian Housewife:
freesome
noun
Etymology From free + -some (collective noun suffix).
1
A free and open pairing among individuals, usually for casual sex; a free for all.
If so, why don't you bring her along and we'll have a freesome.1976, Sean Treacy, Shay Scally and Manny Wagstaff:
“I don't do freesomes,” she announced petulantly.2009, Jennifer Fallon, The Immortal Prince: