Place it as the immediate reaction shot after the failed joke in your edit, then follow it with the sad violin sound button for the letdown, or the wrong answer game show button when the joke was part of a quiz bit.
关于此声音
This is a short 4-second spoken clip of the Portuguese phrase meaning roughly 'real funny guy, not,' delivered as a deadpan put-down. The feeling is sarcastic and dismissive, like eye-rolling at a joke that fell flat, and it lands as a quick mocking reaction rather than genuine laughter or praise.