foo A sample name for absolutely anything,
especially programs and files (especially scratch files).
First on the standard list of metasyntactic variables used
in syntax examples.
The terms foobar, foo, bar, and baz are sometimes used as placeholder names (also referred to as metasyntactic variables) in computer programming or computer-related documentation. They have been used to name entities such as variables, functions, and commands whose purpose is unimportant and serve only to demonstrate a concept. The words themselves have no meaning in this usage. Foobar is sometimes used alone; foo, bar, and baz are sometimes used in that order, when multiple entities are needed.
by fooman99 November 15, 2010
A word originating in Edinburgh meaning vagina.
"Your Foo looks pretty!"
by AndySmith September 02, 2005
"foo" is frequently used by black gangtas as an abbreviated form of the word "fool".
It is sometimes used in a non-offensive way.
"Foo, you scored up ma ride!"
"You better watch yo'self, foo"

"Sup bro, how you been doin', foo!"
by puttytangman May 16, 2005
An indiscriminate word in place of f***. Can also be used as a form of comic relief.
Person 1: Your brother ate your cookie.

Person 2: aw foo!
by Sazuki July 08, 2010
The ''Foo'' is slang, and is usually used by hispanics
Ay Sup Foo!

Ay Foo Your Lowrider Looks Badd!!

Ay Foo Those Tacos Are Good Man
by Mr.Sicc One January 31, 2008
Any living being that Mr. T pities under given circumstances defined by Mr. T himself.
Mr. T: "I pity the fool who tries and takes over the world"
by GoShogun March 24, 2005
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