Gangorian clap
Referenced once in behind-the-scenes dialogue, the Gangorian clap was a type of sexually-transmitted disease.

While filming ,  actor Karl Urban ad-libbed a line in which McCoy told  that the Gangorian clap had passed from Kirk to Nurse , which Kirk professed to know already and which McCoy said Chapel wasn't very happy about. ("Gag Reel",  Blu-ray special features)

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