kaboom
noun
ka·boom kə-ˈbüm 
plural kabooms
informal : the sound of an explosion or crash
heard a loud kaboom
—often used interjectionally Have 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
Don AsherBut it seems to me that the minute you build an emergency fund—kaboom! Along comes an "emergency." Jane Bryant Quinn Phrases
go kaboom 1
informal : 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
Larry Celona and Ruth Brown2
informal : to undergo a sudden, explosive change, failure, etc.
… a few crucial injuries can make the whole equation go kaboom. Paul Zimmerman
Paul Zimmerman
Word History
Etymology
ka-, unstressed syllable prefixed to onomatopoeic words + boom entry 2
First Known Use
1876, in the meaning defined above