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1.
A common term found in unix/linux/bsd program help pages as space fillers for a word.
Or, can be used as a less intense or childish form of fubar.
To run the program, simply cd to the directory you installed it in like this:
user@localhost cd foo/bar

or

The server foobared again?
by FinalPhoenix September 23, 2003
 
2.
The phonetic pronounciation of the acronym "F.U.B.A.R." which stands for "Fucked Up Beyond All Recognition"
That guy was foobar after I stomped a hole in his face!
by Crackazz Cracka February 07, 2003
 
3.
foo bar is very often used in computer programming, used to declare a (temporary) variable.
Most probably, "foo" and "bar" came from "foobar," which in turn had its origins in the military slang acronym FUBAR. The most common rendition is "Fucked Up Beyond All Recognition"
Suppose we have a function named bar and a variable foo. To call the function we use foo bar.
by Dave March 29, 2006
 
4.
1) A placeholder used in programming, and other computer uses

2)Short for the music player foobar2000, named after the above definition
1)
int main() {
int foo;
int bar;
cin >> foo;
cin >> bar;

2)
open foobar
by michaeltheurbandictionarian May 29, 2011
 
5.
A slang term meaning "fucked up beyond all recognition." The saying was used primarilly in programing and originated as fubar, but for political correctness it was changed to foo bar.

Foo and bar also often represent variables.
Dude that thing is foo bar!
by ted_yc April 23, 2006
 
6.
A place that Mr. T wont hang out.
$foo=1; echo "that is $foo foo that i pity!";

$bar="stay out of that foo bar sucka!";
by NotYourFoo July 18, 2010
 
7.
1. A bar full of Fooey goodness
2. A type of wrench
3. A chocolate brand
4. A computing term
5. Slang for a mistake/accident.
6. Can be used opposite barfoo
"I can't believe Jerry ate that dirty Foobar."
"That Foobar won't turn anything"
by MWongaz December 06, 2007