What is whomp whomp?

The phrase "whomp whomp" is often used colloquially to mimic the sound of a muted trombone, which is frequently used in comedic contexts to signify a failure, disappointment, or anticlimax. This sound effect is popular in television shows, cartoons, and radio skits to audibly convey a lack of success or an underwhelming outcome. In written form, "whomp whomp" can be used humorously to acknowledge a mistake or indicate that something didn't go as planned. It's similar in function to saying "wah-wah" or "sad trombone" to humorously denote a letdown.