Place it right after the suspicious reveal in your edit, once the audience has spotted the giveaway, then follow it with FBI Open Up for a bigger payoff, or lead in with Enemy Spotted to set up the accusation.
About this sound
This 11-second clip is a single blunt spoken line delivered in a flat, matter-of-fact voice, with the oath wallahi lending it mock-serious certainty before the teasing punchline. With no music or effects behind it, the delivery feels sudden and absurd rather than aggressive, and the clash between the solemn setup and the playful insult is what makes listeners laugh.