The phrase "massive hit" refers to something that is extremely popular, successful or well-received by a large audience. It can be used to describe a song, movie, book, product, event or any other form of entertainment or media that has gained widespread attention and appreciation from the public. A "massive hit" typically garners a lot of positive reviews, attracts large crowds, generates significant sales or views, and becomes a cultural phenomenon. The term suggests that the thing in question is not only popular but also highly impactful and influential within its respective field or industry.