What is Grim Rainbow?
1.
A "Grim Rainbow" is a term used to describe following a trail which leads to something ultimately pointless, dark, and oftentimes insulting. To follow a Grim Rainbow is to suffer humiliation, and defeat, many times over.
If you believe a Grim Rainbow, then you are suffering from a sad delusion.
"Dude, hearing that Brian Blessed died, only to discover it was a sick joke made me believe in a Grim Rainbow"
See