To cause such intense secondhand embarrassment that you want to disappear from the face of the earth. When something gives you cringe, it's so awkward, so painful, or so out of place that it physically hurts to witness.

To act like you're the protagonist of a movie and the whole world revolves around you. When someone's being the main character, they live every moment as if cameras are following them with a soundtrack playing.

Fear of missing out on something fun that others are doing — that modern social anxiety that makes you check Instagram every five minutes to see what everyone's up to without you. It hits hardest when you chose to stay home.

To get your act together, step it up, and start putting in real effort. When someone tells you this, it's because you've been slacking too hard and need to wake up before it's too late.