Place it at the end of a failed explanation or a forgotten line, after the speaker has already paused. Follow it with a short Bruh for a flat reaction, or swap in a brain fart version when the joke needs a second beat. Keep it as the final gag in the sequence.
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This is a drawn-out fart sound effect lasting about twelve seconds, stretched well beyond a quick joke noise into a long comic blast. It feels silly, crude and deliberately over the top, turning a forgotten thought into a full collapse. It is the blunt, unmistakable noise for a mind going completely blank.