brokeback · adjective1
From break + back; first used for "hunchback" in Carson McCullers' 1943 novella The Ballad of the Sad Café.
brokeback · adjective2
From the title of Annie Proulx's 1997 short story "Brokeback Mountain"; popularised by the 2005 film of the same name.
Etymology from Wiktionary, CC BY-SA 4.0.