rock snot

noun

: 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

Example Sentences

Recent Examples on the Web

The blue-ribbon trout waters of the Rocky Mountain states and the smallmouth fisheries of the Pacific Northwest seem to be ground zero for rock snot in the U.S., but colonies have been found in several Eastern rivers, too. —Colin Moore, Outdoor Life, 7 Feb. 2020

Word History

First Known Use

2005, in the meaning defined above