The Final Reflection

Khest is a profanity which refers to the act of sexual intercourse. It is also used to denote disdain or as an intensifier. It was coined by author John M. Ford and used in his Star Trek novel The Final Reflection .  In the context of the novel, it is a Klingonaase curse.

Khest carries approximately the same meaning and emotional connotation as the American English word, "fuck."