YOLO (You Only Live Once), so don't live with FOMO (Fear Of Missing Out).
This is Internetspeak for the classic inspirational phrase "carpe diem," or "seize the day." To live with regret is one of life's greatest tragedies, so people are encouraged to experience what's out there to either check an item off of their bucket list or know what to avoid in a future. The FOMO mentality has lead to the persistance of many trends and spontaneous decisions, both good and bad.
A Reddit thread asked, "what was that one thing you tried out due to Fear of Missing Out (FOMO)?" Some things are absolutely worth experiencing (South Africa, hugs), and some things are better missed out on (eating ants and grass).
Ate ten ants to join my brothers club in first grade. Said I could only join if I ate ten ants. So I did. And then he disbanded the club.-rainqueen