Etymology
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pong (n.)

by late 1960s as an abbreviation of ping-pong. The electronic arcade game (with capital P-) was released 1972. The word also was or is an Australian derogatory name for a Chinese (1931), and "an unpleasant smell, stink" (1919), in both sense of uncertain origin.

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Definitions of pong

pong (n.)
an unpleasant smell;
Synonyms: niff
From wordnet.princeton.edu