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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Trying way too hard. Taking stuff way too seriously.
Andrew is foo.
by IAMTHEBATMAN33 June 22, 2016

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When you think you need a poo but when you actually try to go it's just a fart.
"You were finished in there quickly"
"Nah, it was just a foo"
by jaiiiiiiiii August 03, 2016

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Foos is short for Table Football..
"hey Joon, wanna do some foos?!", "your sure good at your five man foos hassle!!!"
by _G_ March 10, 2006

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foo refers to someone who had a big cock - that's right
i love that foo and his huge cock
by mr foo April 29, 2006

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Used by the underground hacking community to express the same meaning in the, now famous, word "n00b/noob". Used to describe a POSEUR
(not 'poser', learn to spell idiots) who claim they are hackers but actually don't even know how to overclock their pc.
Timmy: HEy guys!!!!11!!
x<0ver>x: Go away FOO.
Timmy: I am ahacker 2!
Timmy: I hacked Microsft today
x<0ver>x: ...
*idle*
*idle*
Timmy: Hey, it says my computer is shutting down]
x<0ver.x: You deserve it.
Izzy: LOL
by K-A Man June 02, 2004

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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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