Definition
An apprehension that others might be having rewarding experiences from which one is absent.
Origin
Originally coined in the year 2000, the term went viral in the mid-2010s, likely with the increased visibility of social activities afforded by social media (source).
Everyday Use
Truly a concept that can be experienced every day — FOMO seems to be a particularly modern phenomenon, born out of social media and an always-on-panopticon airbrushing of our experiences so that we feel we are the ones being left at the station. It's helpful to remember that _many _of us can feel like this — and its commonality should provide a little comfort that it's not uniquely us who are missing out. In these moments, I also prefer to remind myself of JOMO — the Joy of Missing Out.