Moshi moshi comes from Japanese telephone etiquette and comes from the formal verb mosu, a humble way of saying to speak. It became the standard way to answer a phone in Japan and to check if the other person can hear you. Through anime exported worldwide, the phrase became instantly recognisable even to viewers who do not speak Japanese. Online, elongated cute versions like this one spread on TikTok and soundboards as a shorthand for an anime girl picking up, turning a everyday greeting into a meme reaction.