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!

by eszett March 8, 2003

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?

by jOeFiSh15 January 20, 2009

FOS

Fortress of Solitude

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

by Mai327 June 9, 2011

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!"

by Donatello Quentinstein Kennedy Ripken Sr. September 20, 2007

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.'

by Maria Espia March 17, 2008

FO

Abbreviation of Fuck off

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

by 2451346523562 December 25, 2010

fo

Expression of disgust often heard in Yucatan, Mexico.

Also spelled: Fó

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

by MousePad July 25, 2008