FOMO UK /ˈfəʊməʊ/US /ˈfoʊmoʊ/verb 1noun 1forms 5 verb1 •To experience FOMO (“the fear of missing out”); to act on one's FOMO, often impulsively [(often) with into]. noun1 •Acronym of fear of missing out.Often, because of FOMO, they are reluctant to do these things on their own, but if you can get their friends involved as well, the resistance disappears. — 2010 formsFOMO'd · FOMOed · FOMO-ing · FOMOing · FOMOs