Dunno horselady, I've never heard the expression. When you google it, it comes up as an example of what a metaphor is but isn't further explained.
All I can tell you is there's a song by Sonic Youth called Diamond Sea. Make what you will of the lyrics, they're wide open to interpretation. Great performance here. To me it might be about drug abuse but I really don't know. Oh and I don't know if "your" saying has anything to do with the song - but it might, as it doesn't really seem to be an established saying.
https://www.youtube.com/watch?v=whW7oVPcCYo
Signing off now before I start analysing your username;-)