Use it as the punchline after the suspicious line or action it is calling out, so the accusation closes the scene. Follow it with Anime Ahh as the reply, or Awkward Moment when the joke needs a slower landing after the tease.
About this sound
This five-second clip is a bright, teasing voice line that calls someone a sussy baka in a playful, sing-song delivery. It lands as light-hearted mock suspicion rather than a real accusation, with a cute, exaggerated tone that makes the tease feel affectionate. The line works best as a quick, silly call-out, turning an awkward or shady moment into a joke without sounding harsh.