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What does foo mean?

Looking for the meaning or definition of the word foo? Here's what it means.

Noun
  1. (historical, obsolete) Alternative form of fu: an administrative subdivision of imperial China; the capital of such divisions.
Noun
  1. (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.
  2. (fandom slang) Alternative letter-case form of Foo (“placeholder god”)
Interjection
  1. Expression of disappointment or disgust.
Noun
  1. (slang) Eye dialect spelling of fool.
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