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

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

FOS

Full Of Shit (FOS). A person who likes to talk too much about themselves.

I can't stand my boss he is FOS.

by MoFo medic December 11, 2007

FOS

freedom of speech

The man is FOS (original meaning) ... he does not deserve the FOS.

by MIT-GUY August 11, 2012

FOS

Fuck On Sight. An acronym used by two friends to describe a person who they see who they would like to instantly fornicate with on sight.

Two guys are walking when they see a really hot gurl and one gay says to another FOS? And the other gentleman nods in unison.

by Ilovecurry April 14, 2010

FOS

Word used to describe a person that quiet often doesnt tell the truth, or in other words is "full of shit"

Also known as a "Fossi"

Guy 1: "I once used a cat as a soccer ball"
Guy 2: "ahuh, you're FOS"

by J!M! June 27, 2008