1. be very interested in or get excited about sb/sth
mad/crazy about each other/song/movie
This phrase is colloquial and used in Irish and UK slang. To be 'mad' or 'crazy about' something can mean to like it intensely or enthusiastically: "Tom is crazy about Jenny. He won't stop talking about her." "My son is mad about aeroplanes. He collects models and books about them." If someone 'gets mad about' something, however, it means that they have become angry or annoyed by something: "My father got mad about his team not winning the game." This is a popular phrase in social English.