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1. A filmy or frothy layer of matter that forms on the surface of a liquid or body of water or on a hard surface.
2. The refuse or dross of molten metals.
3. Refuse or worthless matter.
4. Slang One, such as a person or an element of society, that is regarded as despicable or worthless.
v. scummed, scum·ming, scums
To remove the scum from.
To become covered with scum.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
in a scummy manner
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014