doofus

[doo-fuhs]
noun, plural doofuses.
Slang. a foolish or inept person.
Also, dufus.
Compare goofus.


Origin:
1960–65, Americanism; probably alteration of earlier goofus in same sense

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
doofus (ˈduːfəs)
 
n
informal chiefly (US) a slow-witted or stupid person
 
[C20: from Black slang]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Dictionary.com's 21st Century Lexicon
Main Entry:  doofus
Part of Speech:  n
Definition:  See dufus
Dictionary.com's 21st Century Lexicon
Copyright © 2003-2014 Dictionary.com, LLC
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Etymonline
Word Origin & History

doofus
student slang, "dolt, idiot, nerd," by 1960s. "Dictionary of American Slang" says "probably related to doo-doo and goofus," which isn't very helpful.
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

doofus definition

[ˈdufəs]
and duffis
  1. n.
    a jerk; a nerd. : Get out, doofus! , My roommate is a duffis and I'm tired of putting up with her.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
Doofus will have you laughing in the aisles with his unique style of hillbilly humor.
The real doofus is the one who even begins to believe this statistic.
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