rock snot
 n.— «Biosecurity New Zealand is asking river users to avoid the Buller River while it investigates confirmed finds of a highly invasive algae, commonly known as rock snot, that smothers riverbeds.» —“‘Rock snot’ found in Buller” by Simon Bloomberg Stuff.co.nz (New Zealand) Sept. 28, 2005. (source: Double-Tongued Dictionary)

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