What is the definition of Boomboom?

A 'boomboom' is like the sonic boom of a comedian's punchline, but instead of air, it's the explosive sound of a poorly timed pratfall in a horror movie. Imagine if your mom tried to make this sound effect for you: "Just when I thought my dinner was finally done, boom, boomboom!"

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Now, here's an edgy example sentence: "The janitor's 'boomboom' at midnight was so loud, it could've been mistaken for a nuclear explosion, and the janitor's ghost couldn't take it, so he decided to start practicing his own boombomb routine."