FOMO (aka, Fear Of Missing Out)
Here's your citation in American Psychological Association (APA) format:
FOMO (aka, Fear Of Missing Out). (n.d.). In Alleydog.com's online glossary. Retrieved from: https://www.alleydog.com/glossary/definition-cit.php?term=FOMO+%28aka%2C+Fear+Of+Missing+Out%29