Place it as the final beat after a confession or slip-up, then follow the stunned pause with the Bruh sound for the reaction shot. In a montage, let it close the scene before cutting to the Oh My God Meme sound.
About this sound
A very short voice clip saying 'Don't tell nobody bout that' in a low, urgent tone, lasting about a second and a half. It feels sneaky and conspiratorial, like a secret being protected on the spot, which makes the warning sound funnier than serious and instantly usable as a hush-up reaction.