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A person regarded as contemptible, obnoxious, or otherwise undesirable.
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.
slang chiefly US and Canadian a contemptible or undesirable person
[C20: from rat + fink]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
fink(fɪŋk) Slang. n.
1. a strikebreaker.
2. a labor spy.
3. an informer.
4. a contemptible person.v.i.
5. to inform to the police; squeal.
6. to act as a strikebreaker; scab.
7. fink out, to renege.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.