The phrase itself is everyday spoken French, roughly meaning it's just incredible, with quoi added for emphasis in casual conversation. Addressed to Cécile, the line feels lifted from a spontaneous exchange rather than a scripted performance, which helps explain why it works so well when shared out of context. Online, French-speaking creators reuse it as a compact reaction sound for disbelief, surprise and mild exasperation, especially in short edits, chats and meme compilations where a spoken reaction lands faster than a caption.