Etymology
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pom-pom (n.)

"Maxim automatic gun," 1899, of imitative origin, soldiers' slang from the Boer War. For the ornamental tuft, see pompom.

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Definitions of pom-pom

pom-pom (n.)
decoration consisting of a ball of tufted wool or silk; usually worn on a hat;
Synonyms: pompon
pom-pom (n.)
artillery designed to shoot upward at airplanes;
Synonyms: antiaircraft / antiaircraft gun / flak / flack / ack-ack / ack-ack gun
From wordnet.princeton.edu