Usually means: Placeholder term used in examples.
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We found 18 dictionaries that define the word foo:

General (7 matching dictionaries)
  1. foo: Merriam-Webster.com
  2. Foo, foo: Wordnik
  3. Foo, foo, foo': Wiktionary
  4. foo: Dictionary.com
  5. Foo (disambiguation), Foo (game), Foo, Foo: Wikipedia, the Free Encyclopedia
  6. Foo: Rhymezone
  7. FOO, foo: Stammtisch Beau Fleuve Acronyms

Computing (5 matching dictionaries)
  1. foo: Free On-line Dictionary of Computing
  2. foo: CCI Computer
  3. Foo: Game Dictionary
  4. Technopedia (No longer online)
  5. Foo (disambiguation), foo: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Miscellaneous (2 matching dictionaries)
  1. FOO: Acronym Finder
  2. AbbreviationZ (No longer online)

Slang (2 matching dictionaries)
  1. foo, foo: Green’s Dictionary of Slang
  2. foo: Urban Dictionary

Tech (1 matching dictionary)
  1. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)

Definitions from Wiktionary (foo)

noun:  (programming) A metasyntactic variable used to represent an unspecified entity. If part of a series of such entities, it is often the first in the series, and followed immediately by bar.
noun:  (dated, fandom slang, humorous) A mock deity of early science fiction fandom; a fannish ghod.
noun:  (historical, obsolete) Alternative form of fu: an administrative subdivision of imperial China; the capital of such divisions. [flux unit]
noun:  (fandom slang) Alternative letter-case form of Foo (“placeholder god”) [(dated, fandom slang, humorous) A mock deity of early science fiction fandom; a fannish ghod.]
noun:  (slang) Pronunciation spelling of fool. [(derogatory) A person with poor judgment or little intelligence.]

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