Midsommaring

(verb): The act of excessively promoting or hyping a particular event, movie, book, etc. to others, often to the point of annoyance. Inspired by the horror movie Midsommar, where a young couple travel to a remote Swedish village to attend a festival that occurs once every 90 years.

My friend keeps talking about the latest superhero movie, she's been Midsommaring it for weeks now