Gonorrhea is called "the clap" due to several theories about the origin of the term:

• One popular theory is that it comes from the French word "clapier," which means brothel—places where gonorrhea could easily be transmitted. The word "clapier" also referred to a rabbit's nest, relating to rabbits' active sex life, metaphorically linking it to brothels. This term was used historically and eventually shortened to "the clap" in English.
• Another explanation involves an old English word "clappan," meaning to beat or throb, which could describe the painful symptoms of gonorrhea such as burning or throbbing.
• A more physical explanation is related to an old treatment method before antibiotics, where men would "clap" (forcefully slap or press) their penis between their hands or against a board to force out the infected discharge, thus the name "the clap."

These theories all contribute to the colorful history behind why gonorrhea earned the nickname "the clap".