rock snot

noun

Definition of rock snot 

: didymo … one of the latest bodies of water to be infected with Didymosphenia geminata, a fast-spreading single-cell algae that is better known to fishermen and biologists around the world as rock snot.— Anthony DePalma

First Known Use of rock snot

2005, in the meaning defined above

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The first known use of rock snot was in 2005

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