Place it at the exact moment of the mistake in your edit, then follow it with a fart with reverb for a bigger payoff, or precede it with a bruh when someone else causes the blank.
Sobre este sonido
This is a short, high-pitched fart sound stretched to about 1.8 seconds, made to stand in for a sudden mental blank. It lands as silly and a little embarrassing, the audio version of losing your train of thought mid-sentence and knowing everyone noticed at the same time.