Definition
Shiny metallic particles, usually metal debris or contamination, found in oil or other fluids where they definitely shouldn't be—a humorous term for bad news in an engine bay.
Example Usage
We opened up the engine and found forbidden glitter all through the oil; that bearing is toast.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=Forbidden%20Glitter&defid=18491156)
Related Terms
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See “Forbidden Glitter” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.
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