Etymology
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bong (n.1)

bell-sound, 1918, imitative.

bong (n.2)

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

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Definitions of bong
1
bong (v.)
ring loudly and deeply;
the big bell bonged
2
bong (n.)
a dull resonant sound as of a bell;
From wordnet.princeton.edu