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One, especially a politician, who is guided by personal advantage rather than by consistent, respectable principles.
[Perhaps alteration of snallygaster, a mythical beast said to prey on poultry and children, perhaps from Pennsylvania Dutch schnelle geeschter : Middle High German snēl, quick (from Old High German) + Middle High German geist, spirit (from Old High German).]
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.
(Government, Politics & Diplomacy) slang US a politician who cares more for personal gain than serving the people
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014