The phrase c'est elle qui a dit is everyday French for she's the one who said it, and the Ch'ti tag points to the northern dialect associated with Hauts-de-France. Shared as a short soundboard clip under the name ChTio TaZ, it spread less as a quote from a known film or show than as a reusable reaction. Its appeal online is the familiar schoolyard logic of passing responsibility to someone else, which translates easily into memes, short videos and voice messages even for viewers who catch only the tone.