fo

a misspelling of "for" when someone is typing a mile a minute, or in capitalised form, the hypothetical compound of oxygen fluoride

Hey! That oxygen flouride is fo the birds!

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FOS

1. Full Of Shit

2. Female Oral Stimulation

3. Nickname for Andrew Lynn

1. Furby is FOS

2. Morris: I went for a bit of FOS with apiphonyiernfi

3. Are you going to millys FOS?

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FOS

Fortress of Solitude

When the freak from down the street came over for dinner, I retreated to my FOS.

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Fo

Short for a fourty Oz. bottle of Malt Liquor, preferably in OE or Big Bear.

"Yo, man, we're gonna need about 6 Fos tonight!"

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FOS

n. to describe a person who is 'Full Of Shit', and treats those who try to help them with disrespect.

Person 1: 'I'm not coming to my doctor's appointment today because you didn't tell me I had to pay anything.'
Person 2: 'Don't be such a FOS.'

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FO

Abbreviation of Fuck off

Guy one: I don't like you
Guy two: FO

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fo

Expression of disgust often heard in Yucatan, Mexico.

Also spelled: Fó

Guy: Look at Pedro, he barfed all his cerveza.
Chick: Fo!

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