informal : the sound of an explosion or crash
//heard a loud kaboom—often used interjectionallyHave you ever watched metallic sodium hit water? Kaboom. Krakatau revisited …— Don AsherBut it seems to me that the minute you build an emergency fund—kaboom! Along comes an "emergency."— Jane Bryant Quinn
go kaboom
1informal : to explode or crash violently
… when the house exploded the night before, cops believed that it had been a drug factory that went kaboom …— Larry Celona and Ruth Brown
2informal : to undergo a sudden, explosive change, failure, etc.
… a few crucial injuries can make the whole equation go kaboom.— Paul Zimmerman
First Known Use of kaboom
1876, in the meaning defined above
History and Etymology for kaboom
ka-, unstressed syllable prefixed to onomatopoeic words + boom entry 2