Usually means: Substitute for explicit profanity; euphemism.
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We found 34 dictionaries that define the word eff:

General (17 matching dictionaries)
  1. eff: Merriam-Webster
  2. eff, eff: Oxford Learner's Dictionaries
  3. eff: Collins English Dictionary
  4. eff: Vocabulary.com
  5. Eff, eff: Wordnik
  6. eff: Cambridge Advanced Learner's Dictionary
  7. EFF, eff: Wiktionary
  8. eff: Infoplease Dictionary
  9. EFF, eff: Dictionary.com
  10. EFF, Eff (duo), Eff: Wikipedia, the Free Encyclopedia
  11. eff: Rhymezone
  12. eff: Webster's 1828 Dictionary
  13. EFF: Stammtisch Beau Fleuve Acronyms
  14. eff: FreeDictionary.org
  15. eff: Mnemonic Dictionary
  16. eff: TheFreeDictionary.com
  17. eff: Longman Dictionary of Contemporary English

Art (1 matching dictionary)
  1. ODLIS: Online Dictionary of Library and Information Science (No longer online)

Business (2 matching dictionaries)
  1. Glossary of Trade and Shipping Terms (No longer online)
  2. Travel Industry Dictionary (No longer online)

Computing (6 matching dictionaries)
  1. EFF: Free On-line Dictionary of Computing
  2. EFF: Netlingo
  3. EFF: CCI Computer
  4. Technology Terms and Acronyms (No longer online)
  5. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  6. eff: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. EFF: Medical dictionary

Miscellaneous (3 matching dictionaries)
  1. EFF: Acronym Finder
  2. EFF: Three Letter Words with definitions
  3. AbbreviationZ (No longer online)

Slang (1 matching dictionary)
  1. eff, eff: Green’s Dictionary of Slang

Tech (2 matching dictionaries)
  1. EFF: Webster's New World Telecom Dictionary
  2. Explosives (No longer online)

(Note: See effing as well.)

Definitions from Wiktionary (Eff)

verb:  (euphemistic, slang) Fuck (the taboo swear word, but not in the sense "to copulate")
verb:  To put into words; to express.
noun:  Alternative spelling of ef; the name of the Latin-script letter F/f. [The name of the Latin-script letter F/f.]
noun:  (Internet, electronics, politics) Initialism of Electronic Frontier Foundation.
noun:  (South Africa, politics) Initialism of Economic Freedom Fighters.
noun:  Alternative letter-case form of eff

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