Etymology
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kung fu (n.)

also kung-fu, 1966, a generalized Western term for Chinese martial arts, from dialectal Chinese kung fu, a term said to refer to any skill acquired through learning or practice.

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ipse dixit 
Latin, literally "he (the master) said it," translation of Greek autos epha, phrase used by disciples of Pythagoras when quoting their master. Hence, "an assertion made without proof, resting entirely on the authority of the speaker" (1590s), ipsedixitism "practice of dogmatic assertion" (1830, Bentham), etc.
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white elephant (n.)
"burdensome charge, inconvenient thing that one does not know how to get rid of," 1851, supposedly from the practice of the King of Siam of presenting one of the sacred albino elephants to a courtier who had fallen from favor; the gift was a great honor, but the proper upkeep of one was ruinously expensive.
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