Brain fart sounds belong to a long online tradition of using exaggerated fart noises as shorthand for a mental blank. Instead of a quick toot, this version stretches the effect out, which became popular in meme edits and prank soundboards where longer, louder bodily sounds get bigger reactions. It is shared as a generic comedy effect rather than a clip from a known film or show, and creators keep reusing it because the meaning is clear in any language and works over almost any failed moment on screen daily.