The English language is an ongoing matter of debate here on diablog. It is an endless source of entertainment - at least for me.
You are asking for another example? OK, here is one of my favorites.
People refer to redheads as "Ginger". If you don't believe me, do an internet image search for "ginger hair" and pictures like this show up:
And this is what actual Ginger looks like:
Very accurate, I'd say.
Also, I am sure, you have heard the expression "strawberry blond". Again, an internet image search shows plenty of this:
Yet, this is what an actual strawberry looks like:
Reasonable or funny explanations - from women, Casper, in particular - are very welcome.