Place it at the exact moment a bite is swallowed in a food edit, then follow it immediately with the shocked sound for the reaction, and finish with the oh no no no laugh as everyone processes what just happened on camera.
このサウンドについて
This is a short, roughly four-second clip of a person letting out loud, unapologetic burps, recorded close and clear with nothing else competing for attention. It feels gross, childish and deliberately rude, the kind of sound that breaks polite conversation on purpose and gets an instant laugh or grimace in response.