Interesting compound words used in the UK

Do you know what does it mean?

1. Helicopter parent: this phrase refers to a mother or a father who is incapable of letting their offspring make their own decisions or go out into the big, wild world without their support. The metaphor creates an image of parents hovering just above their children´s heads, just waiting for to make a mistake.

https://www.lindseypollak.com/helicopter-parents-workplace-happens-needs-stop/

2. an ear worm: this phrase describes a song or a piece of music that is so catchy that you can´t get it out of your mind once you have heard it.

https://sabakuch.com/blog/2017/06/14/is-your-song-an-earworm-find-out/