36
Shape of mouth used in Irish Sign Language (ISL) by Deaf signers with following sign: fist ('F') at chin level shoots forward the fist sideways with index and long finger out in shape of gun barrell ('OO').

Used to describe someone who:
i) Tripped up big time - unintentionally;
ii) was easily lead on;
iii) believed a cock and bull story;
iv) holder of Darwin award
As signed:

'FOO' (laugh unbelievingly)
'YOU FOO' (look disgusted or sneery)
'HE FOO' (roll eyes at man admitting he was take in by some womans bullshit)
'SHE FOO' (look up and down fallen drunk woman in amazement)
'FOO?!' (Shake head in disbelief)
by ISL Slang Master February 06, 2004
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37
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 20, 2004
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38
A foo is a person that uses their foolish actions to come across as overwhelmingly cute.
Do you know a girl that has the power to put the biggest smile on your face anytime words come out of her mouth? Yep, that girl be a foo.
by SkurtSkurt May 12, 2014
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39
short for fool. Like calling someone a fool, but they are so stupid they don't deserve the last "l" so you just call them foo.
That foo stuck his finger in the flame to see if it was warm.
by Lauren R April 21, 2008
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40
The fleshy part of the human body that you sit on; Ideal for Bikers ;)
Look at the Foo on that..
by PiOn December 29, 2004
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