MILLENNIAL SLANG I DON'T UNDERSTAND

How am I already old?
  1. 🔑
    I see this a lot. Why does everyone use this? I hope it's a Philosopher's Stone thing, but I know in my heart it's probably not.
  2. Woke
    I'm guessing it doesn't mean "awake." Maybe "alert?"
  3. Lit
    Is this a synonym for woke?
  4. Phubbing
    I don't know what this is but it sounds like a sex thing.
  5. FOMO
    Is this like YOLO?
  6. Bae
    I know generally what this means, but I always forget what the letters stand for. Side note: if it's an acronym, should it not be BAE?