Eutrapelia comes from the Greek for 'wittiness', referring to pleasantness in conversation. It is one of Aristotle's virtues, the "golden mean" between boorishness (ἀγροικια) and buffoonery (βωμολοχια). Later on it came to mostly signify jokes that were obscene and coarse. The word appears only once in the New Testament, in Ephesians 5:4, where it is translated "coarse jesting" in the NIV.
Foster, Edgar. "Foster's Theological Reflections: Brief Word Study on Eutrapelia". http://fosterheologicalreflections.blogspot.com/2009/02/brief-word-study-on-eutrapelia.html. Retrieved 2009-06-02.