The line is in everyday French and translates to I ate very well at KFC, which explains why it travels as a caption rather than a traditional catchphrase. Its humor comes from treating a routine chain restaurant meal like a proud achievement worth announcing formally. Shared widely in French speaking chats, short videos and soundboards, it has become shorthand for being happily full after fried chicken. Because no context is needed beyond the brand and the satisfied delivery, even non French speakers use it as a recognizable post meal reaction.