Multicultural Toronto English (MTE) is a register found in Toronto, Canada, associated with racialized youth. The ongoing enregisterment of MTE takes place, in part, through metadiscourse on social media, which disseminates the register to a wider audience. This article examines online metadiscursive engagement with representations of MTE. We consider how audiences take up, receive and recontextualize MTE through metadiscourse across grassroots and institutional media platforms. We argue that audience engagement with pop-cultural representations of language is a critical driving force of enregisterment and register change.