Oh wow. At first I didn't care but once you start hearing it like every five minutes it gets annoying and it starts to lose its meaning. Now people are just doing it to fit in not because they believe in the concept but because everyone else is doing it and they want to somehow be accepted.
When YOLO first came to the 'know' random weird things would happen at my school, (like they'd drop books down the center of the three story set of swirly stairs or they'd carry water buckets and dump water on people) then the culprit would run away screaming, "YOOOOOLLLOOOOO!"
Like seriously, all throughout the halls you'd hear: "YOLO!" and then some teachers would go running to see what kind of damage they caused. Eventually our school band us from saying or doing 'YOLO' activities. It was so stupid, but extremely funny.