Place it at the end of a rambling clip as the closing reply, then follow it with Bruh or Emotional Damage when the shut-down needs a bigger payoff. Put it after the talker, never before the setup, so the reply earns its place in the edit.
Über diesen Sound
This slowed Portuguese voice clip centers on the phrase cala boca, meaning shut up, and runs for about eight seconds. The drawn-out delivery makes the interruption feel blunt, impatient and deliberately over the top, like a friend cutting through a long story with one firm word. It lands as a comic shut-down rather than a gentle aside, which is why it works best as a short, pointed reply.