kaboom /kəˈbuːm/noun 2exclamation 1verb 1forms 3 noun2 •The sound of an explosion, typically seen in comic strips or heard in a light-hearted conversation. •An explosion itself. exclamation1 •An explosion; the word is typically seen in comic strips or heard in a light-hearted conversation. verb1 •(informal) To make such a sound (at something); to explode.Hearing that magic word, Spivak exploded, “I don’t have to listen to this shit!” and kaboomed the receiver in my ear. — 2006 formskaboomed · kabooming · kabooms