adjective, adverb Slang.
(used as an intensifier).

1940–45; euphemism for fucking, with eff as spelled form of the name of the initial letter

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[ef] Slang.
verb (used without object), verb (used with object), interjection
fuck: Stop effing around and get to work! Eff you, you lout!
the word “fuck”; the f-word: peppering his speech with superfluous and highly offensive effs.
Verb phrases
eff off, Go away!: Eff off and die, you piece of Martian scum!

1940–45; euphemism for fuck, with eff as spelled form of the name of the initial letter

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
eff (ɛf)
1.  euphemism for fuck : eff off
2.  slang eff and blind to use obscene language
n, —adj, —adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1943, euphemism for fuck, representing the sound of its first letter. Related: Effing.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
  1. Electronic Frontier Foundation

  2. [National Weather Service] Experimental Forecast Facility

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The mind that came up with that has got to be pretty effing sweet.
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