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Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree
adj. def·fer, def·fest Slang
[Short for definite.]
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 very good, esp of hip-hop
[C20: perhaps from definitive]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
[1975–80, Amer.; < W Ind E pronoun of death used as an intensifier]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.