Usually means: Sound made by a cow.
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We found 45 dictionaries that define the word MOO:

General (26 matching dictionaries)
  1. moo: Longman Dictionary of Contemporary English
  2. moo: Merriam-Webster
  3. moo: Oxford Learner's Dictionaries
  4. MOO, moo: American Heritage Dictionary of the English Language
  5. moo: Collins English Dictionary
  6. moo: Vocabulary.com
  7. Moo, moo, the-moo: Wordnik
  8. moo: Cambridge Advanced Learner's Dictionary
  9. MOO, Moo, moo: Wiktionary
  10. moo: Webster's New World College Dictionary, 4th Ed.
  11. moo: The Wordsmyth English Dictionary-Thesaurus
  12. moo: Infoplease Dictionary
  13. MOO: Dictionary.com
  14. moo: Online Etymology Dictionary
  15. moo: Cambridge Essential American English Dictionary
  16. MOO (programming language), MOO, Moo (Monster Ranchers), Moo (disambiguation), Moo (novel), Moo: Wikipedia, the Free Encyclopedia
  17. Moo: Online Plain Text English Dictionary
  18. moo: Webster's Revised Unabridged, 1913 Edition
  19. moo: Rhymezone
  20. Moo: AllWords.com Multi-Lingual Dictionary
  21. MOO: Stammtisch Beau Fleuve Acronyms
  22. moo: FreeDictionary.org
  23. moo: Mnemonic Dictionary
  24. MOO: TheFreeDictionary.com

Art (1 matching dictionary)
  1. Glossary of Stamp Collecting Terms (No longer online)

Computing (10 matching dictionaries)
  1. moo: Webster's New World Hacker Dictionary
  2. MOO: Free On-line Dictionary of Computing
  3. MOO: Netlingo
  4. MOO: CCI Computer
  5. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  6. Glossary of Internet Terms (No longer online)
  7. MOO: ILC Internet Terms
  8. Webopedia (No longer online)
  9. SMS Dictionary (No longer online)
  10. MOO, Moo (disambiguation): Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. Moo (disambiguation), moo: Medical dictionary

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

Slang (3 matching dictionaries)
  1. moo, moo: Green’s Dictionary of Slang
  2. moo: English slang and colloquialisms used in the United Kingdom
  3. Moo, mo'o: Urban Dictionary

(Note: See mooed as well.)

Definitions from Wiktionary (MOO)

noun:  (onomatopoeia) The characteristic lowing sound made by cattle.
noun:  (UK, slang, mildly derogatory) A foolish woman.
verb:  (intransitive) Of a cow or bull, to make its characteristic lowing sound.
noun:  A surname.
noun:  (video games) Initialism of Master of Orion.
noun:  Initialism of matter of opinion.
noun:  (video games) Initialism of MUD, object-oriented.
noun:  (dated, Postal Romanization) Initialism of Money Order Office.
noun:  (astronomy) Initialism of massive overdense object.

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