flubber

The English word “flubber” has 2 meanings listed here.

noun

A rubbery polymer formed by cross-linking of polyvinyl alcohol with a boron compound, used as a plaything or to demonstrate physical properties.
One who flubs; a goof, a person who makes errors while speaking.

Blend of flying + rubber; originally the name of a fictional substance in the film The Absent-Minded Professor (1961).

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.