The sound comes from Liberty Mutual Insurance television commercials built around a simple sung tagline repeating the company name four times. Online listeners began hearing and captioning one of the repetitions as Biberty, turning a straight insurance slogan into an absurdist meme word. Short reposts on TikTok, YouTube and soundboards isolated just that chant, making it easy to reuse out of context. It stays popular because almost everyone in the US recognises the melody instantly, even when they have never bought a policy from the company.