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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"
by Fire Guardian April 06, 2006
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The vengeful act of crapping on a lover's chest while they sleep.

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