Brain fart is a long-running slang phrase for a sudden mental blank, and earrape describes the internet editing style that deliberately boosts a clip until it distorts and crackles. Combined, the two ideas became a staple of meme edits and short-form videos, where an over-the-top noise does the work of a caption. This version fits that pattern: it is short, recognisable as a joke and easy to drop over a fail, a pause or a bad take. Its popularity comes from that simplicity, since viewers do not need context to understand that someone lost their train of thought.