The story
From gay (“homosexual”) + cancer (“disease”). From the fact that HIV/AIDS was in its beginnings very disproportionately found in homosexual men. The word “cancer” from the analogy with a suddenly emerging, highly feared and highly lethal disease.
First known use, by meaning
- Used in the 1980s. Synonym of acquired immune deficiency syndrome (AIDS).
Etymology from Wiktionary, CC BY-SA 4.0.