It's [a song](Bette Davis Eyes https://g.co/kgs/BK7y7F8) that's referencing two silver screen era actresses. Garbo was famous for her standoffishness and an iconic sigh, and Bette had these incredible, large eyes.
If you've never seen a Bette (pronounced Betty) Davis movie, she was absolutely fucking fierce. Seriously, she could be a rapid dog in a ballgown when she wanted to be, but she could also play demure, shrinking violets when she needed to. She had a bit fued with Joan Crawford. She only ever made one movie with her (Whatever Happened to Baby Jane), but my favorite movie of her's is Hush Hush, Sweet Charlotte, and I highly, highly recommend literally every human check that one out.