short for "phooey"; term used when something goes unaccording to plan or when something unexpected happens.
"Foo! That wasn't supposed to happen!"
by kaili June 21, 2004
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stuff fought by an awesome band called foo fighters
dude: man they are kicking the shit out of that foo
dude2: wtf is foo?
dude: your mom is foo, now shut up and listen
by foo fighter May 23, 2005
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a synonym for the word 'fart' .

foo=fart
food=farted
fooing=farting
eww alyssa food!
Jennifer food in the go kart.
Manna food in the go kart and alyssa thought it was the guys who worked at the track.
by Manna Banana March 8, 2008
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Saying some one is a dumb person it is a slang meaning for fool
by Shib May 14, 2002
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A cry of exasperation. Generally triggered by something traumatizing to your personal psyche. See foomatic.
Man: "I'm going to be late again."

Woman: "Foo."
by hampuff June 20, 2005
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