Gonorrhea has been called the clap for potentially hundreds of years. Slang terms for STDs are often common due to the social stigma around talking about them. They are usually based on the name of the disease itself or on an iconic aspect of the disease.
Gonorrhea is unique in that the slang term, “the clap,” does not have a known origin. However, there are a few interesting theories as to how the term came to exist.
The origin could come from old English. The word “clappan” was used to describe a beating or throbbing. This could refer to the painful, burning urination or swelling in the penis or vagina caused by gonorrhea.
A number of people believe that the name stems from a proposed treatment during medieval times of “clapping” the penis or slamming the penis between both hands (or a hard surface) to get rid of the discharge/pus and thus the infection. This theory has most likely gained popularity due to the treatment’s gruesome nature.
In the 1500’s, “clapier” was an old French word for brothel. The use of the clap then would have referred to the location where the disease most easily spread: brothels. In French, the disease then became known as “clapier bubo” meaning an infection of the penis resulting from a visit to a brothel.
There are also a few theories that come from more modern times. During the early 1900’s, GIs often were infected with gonorrhea during the World Wars. It was sometimes said that they had “the collapse,” which was shortened and transformed into the clap. A 1918 Medical journal is cited as referring to “gonorrhea clap” as well as calling it the “running range,” but does not describe why the name exists.