Kaboom is the loud, explosive sound of something blowing up or bursting apart. It's what you hear (or imagine hearing) when fireworks explode in the night sky, when a cartoon character accidentally sets off dynamite, or when a demolition crew blasts an old building to rubble.

The word itself sounds like what it describes: the sharp “ka” followed by the deep, resonant “boom” mimics the actual noise of an explosion. Writers use kaboom in comic books and stories to capture that sudden, powerful burst, often in big, bold letters: KABOOM!

Kids might say kaboom while playing with toy cars that crash spectacularly, or while describing how a water balloon bursts on impact. Scientists might use more technical terms like “detonation” or “explosion,” but kaboom captures the dramatic, attention-grabbing nature of things going boom in a way that feels immediate and exciting.

The word suggests something sudden and complete. Unlike a gradual collapse or a quiet pop, a kaboom is unmistakable: loud, dramatic, and usually leaving quite a mess behind.