Life What is FoMO slang for? How the fear of missing out might be tanking your mental health. January 20, 2023January 21, 2023 Anna Kaufman, USA TODAY Comments Off on What is FoMO slang for? How the fear of missing out might be tanking your mental health. FoMO, internet-speak for the fear of missing out, is a common affliction in the social media age. Here's what causes it, and how to avoid triggers.