Etymology
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bong (n.2)

"water pipe for marijuana," 1960s, U.S. slang, said to have been introduced by Vietnam War veterans and said to be from Thai baung, literally "cylindrical wooden tube."

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bong (n.1)

bell-sound, 1918, imitative.

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bongo (n.)

"one of a pair of attached small drums held between the knees and played with the fingers," 1920, from American Spanish (West Indies, especially Cuba), from a word of West African origin, such as Lokele (Zaire) boungu. Related: Bongos.

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