Definitions
Century Dictionary and Cyclopedia
- n. See fu.
Wiktionary
- n. computing 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.
- interj. Expression of disappointment or disgust.
- n. slang fool, foolish person.
Etymologies
- Onomatopoeia. (Wiktionary)
Examples
“Else If (foo = colors\%A_Index\%) msgbox foo contains \% foo\%, that's a color!”
“INSERT dbo. foo (i) VALUES (@foo), (@foo+1), (@foo+2);”
“I am not sure if woodsman1st was suggesting all cuts be cooked on top of the stove, but cast iron, some root vegetables and no foo-foo is the way to go.”
“I've seen such prints hanging in foo-foo galleries where pieces are mostly afforded by people named Muffy or Biff.”
“The code above simply creates a variable called foo, which is equal to the returned object.”
“You might expect this to echo "foo" -- but it won't.”
“If my personal information was stored in a knowledge base, then Things.app could share the same basic relationship objects as the inbuilt task list. (is-a-task foo), (title foo "Feed the cat"), (is-urgent foo), (due-on foo (date 2009 12 16)), but also add its own: (is-a-project bar), (title bar "World domination"), (is-part-of foo bar).”
“Just as the magic of foo is being different from other conferences, part of the magic of bar is that it’s not foo.”
“I've seen a very short clip of him saying a couple lines as B.A., one of them including his favorite word foo', and it sounded terribly forced and just showed baaad acting.”
“Wii is still a hot item – I scored one using a free tracking service and wrote about it on my blog (click my name foo!).”
EXTRALIFE – By Scott Johnson - Tonight’s ELR: Your Geek Buying Guide Episode
Lists
These user-created lists contain the word ‘foo’.
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gangster
random gangster lingo and street slang with extra absurdities.
( open list, randomness )
related:
http://www....swagga, chinga, slams, blitzy, earf, manor, code name, rekkid, weight, feather, kong, swisher and 323 more...
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Super Geeky Word List
as a techie, I run across nerd words.
brane, polyamide, phb, PHB, BOFH, redditor, grammar nazi, phaser, trending, SPOILER ALERT, surface mount, FMEA and 73 more...
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disinformation
words meaning bad or not real data
foo, gobbledygook, spin, blacklist, corrupt, fraudulent, debauched, nefarious, untrustworthy, spam, deranged, mental and 22 more...
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method
( investigation, randomness )
empirical, evidence, measurable, specific, quantifiable, principle, tact, foo, betwixt, axiom, maxim, uncertainty and 9 more...
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test2029
humblebrag, bar, foo, hotel, california, FO, Mint, Shiznit, aw, sexy, BUMMERS, thatch and 29 more...
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my test list
some words I want to play with
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testlist
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Twitter favorites
The new favourite words of people on Twitter.
A script searches Twitter for "X is my new favorite word" and adds it to this list.
See also:
grabbable, retuiteando, leaving, fantastic, absolutely, kurwa, hella, ridic, underpass, hate, interlude, plush and 2369 more... -
my test list
some words I want to play with
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my test list
some words I want to play with
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my test list
some words I want to play with
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my test list
list updated at 1338684431
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my test list
list updated at 1338684603
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Just 'cause I like 'em, F
felony, frolic, fend, fuselage, farthingale, freewheeling, frigorific, flummery, fancypants, felsitic, flagstone, flageolet and 295 more...
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Name-Calling for Fun and Profit
I figured out the thing all these terms have in common, besides that they can be used as insults. They all crack me up.
drip, yahoo, dweeb, nimrod, wanker, nincompoop, weasel, skank, fussbudget, dink, twit, guttersnipe and 125 more...
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my test list
some words I want to play with
Tweets
Looking for tweets for foo.

alexz I heard a story that the foo-fighters (band) got their name from the term for an unidentified flying object, or unknown enemy airplane.
foo is used heavily as a variable or function name in computing science. this goes back to before I studied CS in the 80's.
doing a quick search of Google books, an early use of FOO in computing goes back to 1950 to the output of a diagnostic program which would print out FIBA FOO when it ran properly. http://goo.gl/WUmgB
Jan 4, 2013
ruzuzu I pity the foo.
(I'm sorry, but somebody had to say it.) Feb 8, 2012
seanahan Also, see bar and baz. Oct 4, 2007
reesetee Notary Sojac?? So that's where my dad got that term! Oct 3, 2007
john Me too foo. The Jargon File has a great overview of this word, with citations going back to the 1930s. Oct 3, 2007
uselessness So do I, foo. Mar 26, 2007
alguien I use this word too much. Mar 26, 2007