The exact source of this version is unclear, but “erm actually” became a widely recognized internet phrase for mocking pedantic, know-it-all behavior. It spread across meme edits, short-form reaction videos and comment-section jokes, especially when creators wanted to parody someone making an unnecessary correction. The clip stays popular because the joke is instantly readable without setup: one line can frame a person as smug, awkward or overly literal. It often appears in the same kind of reaction edit space as bruh and buzzer sounds.