ka-boom
[ kuh-boom ]
/ kəˈbum /
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interjection
(used to represent a sudden and loud sound, as of an explosion or a bass drum).
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for kaboom
You zone out until what I'm trying to convey reaches critical mass, and then kaboom, and I'm the bad guy, and bye- bye messenger.