Place it at the end of a short reaction edit, right after the clip of the boast itself, then follow a beat later with the vine boom sound for the reveal, or swap in the anime wow sound when the moment is more amazed than accused.
About this sound
This is a roughly three-second spoken clip of a man exclaiming in Portuguese, “orra nego, tu es um baita ein,” with stretched emphasis on the opening word. It gives listeners a stunned, half-amused disbelief, like catching someone being shamelessly bold and needing a second to process it before laughing.