Pornographic material, primarily in the form of videos and pictures, that is unintentionally or accidentally viewed by people in a crowded public area, usually while seated together, such as on a train, bus, flight, or in a theater. It has become more prevalent in recent years with the increased use of mobile electronic technology, such as laptops, smartphones, and similar devices.

A portmanteau of carpe diem, a Latin phrase that means “Seize the Day!” and DM, which stands for Direct Messages. This word means seizing the day via DMs.