Fomo is short for fear of missing out, a phrase that became widely used online to describe anxiety about being left out of social events, trends, or limited offers. Short clips using the term spread on social feeds and in group chats as a shorthand reaction, especially around product drops, ticket sales, parties, and viral challenges. Instead of explaining the feeling, creators drop the sound as a label for the moment, which is why it remains useful for quick edits, reaction posts, and everyday jokes about wanting to be included.