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

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

by Mai327 June 09, 2011

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

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

by MoFo medic December 11, 2007

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

by MIT-GUY August 11, 2012

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

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