foo

(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.

(dated, fandom slang, humorous) A mock deity of early science fiction fandom; a fannish ghod.

(slang) Pronunciation spelling of fool. [(derogatory) A person with poor judgment or little intelligence.]

(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.]

(historical, obsolete) Alternative form of fu: an administrative subdivision of imperial China; the capital of such divisions. [flux unit]